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JGJ 18-2012: Specification for Welding and Acceptance of Reinforcing Steel Bars
JGJ
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
Record No.. J 253-2012
P JGJ 18-2012
Specification for Welding and Acceptance of
Reinforcing Steel Bars
Issued on. MARCH 01, 2012
Implemented on. AUGUST 01, 2012
Issued by. Ministry of Housing and Urban-Rural Development of the
People’s Republic of China
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Specification for Welding and Acceptance of
Reinforcing Steel Bars
Approved by. Ministry of Housing and Urban-Rural Development of the People’s
Republic of China
Implemented on. AUGUST 01, 2012
2012 Beijing
Table of Contents
Foreword... 6
1 General Provisions... 8
2 Terms and Symbols... 8
2.1 Terms... 8
2.2 Symbols... 11
3 Materials... 14
4 Welding of Reinforcing Steel Bar... 16
4.1 Basic provisions... 16
4.2 Resistance spot welding of reinforcing steel bar... 21
4.3 Flash butt welding of reinforcing steel bar... 22
4.4 Flash butt welding of stirrup... 25
4.5 Arc welding of reinforcing steel bar... 27
4.6 Electroslag pressure welding of reinforcing steel bar... 33
4.7 Gas pressure welding of reinforcing steel bar... 36
4.8 Submerged-arc pressure welding of reinforcing steel bar at prefabricated
components... 38
4.9 Submerged-arc stud welding of reinforcing steel bar at prefabricated
components... 40
5 Quality Inspection and Acceptance... 42
5.1 General requirements... 42
5.2 Welded frame and welded fabric of reinforcing steel bar... 46
5.3 Flash butt welded joint of reinforcing steel bar... 48
5.4 Flash butt welded joint of stirrup... 49
5.5 Arc welded joint of reinforcing steel bar... 49
5.6 Electroslag pressure welded joint of reinforcing steel bar... 51
5.7 Gas pressure welded joint of reinforcing steel bar... 52
5.8 T-joint of reinforcing steel bar at prefabricated components... 53
6 Examination of Weldor... 55
7 Welding Safety... 59
Appendix A Quality Acceptance Record of Welded Joints Inspection Group of
Reinforcing Steel Bar... 62
Appendix B The Certificate of Weldor Examination for Reinforcing Steel Bar 69
Explanation of Wording in This Specification... 72
List of Quoted Standards... 73
1 General Provisions
1.0.1 This Specification was formulated with a view to adopting reasonable welding
procedure and unified quality acceptance criteria, achieving construction safety,
guaranteeing quality, advanced technology, material and energy conservation in the
welding procedure of reinforcing steel bars.
1.0.2 This Specification is applicable to welding procedure of reinforcing steel bars and
the quality inspection and acceptance in generally industrial and civil construction
engineering concrete structure.
1.0.3 Welding procedure of reinforcing steel bar and the quality inspection and
acceptance shall not only be carried out according to this Specification, but also comply
with the provisions of relevant current national standards.
2 Terms and Symbols
2.1 Terms
2.1.1 Hot rolled plain bars
Finished reinforcing steel bar that is formed by hot rolling, generally with circular cross
section and smooth surface.
2.1.2 Hot rolled bars
Reinforcing steel bar that is delivered according to hot-rolled state, whose
metallographic structures are mainly ferrite and pearlite and shall be free from other
microstructures (such as tempered martensite microstructure on base circle) with
influence on service performance.
2.1.3 Hot rolled bars of fine grains
Reinforcing steel bar of fine grains that is formed through controlled rolling and cooling
process in the hot-rolled process, whose metallographic structures are mainly ferrite
and pearlite and shall be free from other microstructures (such as tempered martensite
microstructure on base circle) with influence on service performance; their grain size
shall be no greater than Grade 9.
2.1.4 Quenching and self-tempering ribbed steel bars
Finished reinforcing steel bar that is obtained through surface-controlled cooling in
utilization of heat treatment principle after hot rolling and completion of tempering in
utilization of residual heat of the core itself. Quenching and self-tempering ribbed steel
bars have a diversity of designations; where the welding is necessary, RRB400W
weldable quenching and self-tempering ribbed steel bars shall be selected.
2.1.9 Flash butt welding of stirrup
A kind of pressure welding method that both ends of waiting weld stirrup are placed on
the butt welder in butting form; intense flash and splash are generated in utilization of
resistance heat to melt metal at the contact point; then an upset force is rapidly applied,
and closed-loop stirrup is formed by welding.
2.1.10 Shielded metal arc welding of reinforcing steel bar
A kind of fusion welding method that welding rod is regarded as one electrode and
reinforcing steel bar as another electrode; and welding is carried out through produced
arc heat in utilization of welding current.
2.1.11 Carbon-dioxide arc welding of reinforcing steel bar
A kind of fusion welding method that welding wire is regarded as one electrode and
reinforcing steel bar as another electrode; and carbon dioxide gas is regarded as arc
medium to protect metal drop, welding pool and hot metal in weld zone. Carbon-dioxide
arc welding is hereinafter referred to as CO2 welding.
2.2 Symbols
2.2.1 Symbols of reinforcing steel bar.
3 Materials
3.0.1 Chemical composition and mechanical property of welded reinforcing steel bar
shall comply with the provisions of relevant current national standard.
3.0.2 Low carbon steel or low alloy steel may be adopted for steel plates and section
steel in welded joint of reinforcing steel bar at prefabricated components as well as
molten tank auxiliary rod and groove welded joint; and the mechanical property and
chemical composition shall comply with the provisions of the current national standards
Carbon Structural Steels (GB/T 700) or High Strength Low Alloy Structural Steels
(GB/T 1591).
3.0.5 Among electroslag pressure welding as well as submerged-arc pressure welding
and submerged-arc stud welding of reinforcing steel bar at prefabricated components,
HJ 431 fused flux may be adopted; in submerged-arc stud welding, SJ101 fluorine-
alkali agglomerated flux may also be adopted.
3.0.6 Welded reinforcing steel bars and steel plates shall be provided with quality
certificate; welding rods, welding wire, oxygen, dissolved acetylene, liquefied
petroleum gas, carbon dioxide gas and flux shall be provided with product
certificate.
3.0.7 Welding materials shall be sorted for storage, and handled appropriately; the
measures against rust and deterioration through moisture shall be taken.
4 Welding of Reinforcing Steel Bar
4.1 Basic provisions
4.1.1 During welding of reinforcing steel bar, application scope of welding methods
shall comply with the provisions specified in Table 4.1.1.
4.1.2 Electroslag pressure welding shall be used for connection of vertical stressed
bars in cast-in-place concrete structures for structures such as column and wall; and
shall not be used for connection of horizontal reinforcing steel bar in the members such
as beam and plate.
4.1.3 Before commencement of welding in reinforcement works, the weldors
who participate must go through welding procedure test under site conditions
and can use it for welding production after the test qualification.
4.1.7 Flash butt welding, electroslag pressure welding or gas pressure welding may be
carried out for two pieces of reinforcing steel bars with the same designation and
different diameters. Where the flash butt welding is carried out, diameter difference of
reinforcing steel bar shall be no greater than 4mm;
4.1.8 Flash butt welding, arc welding, electroslag pressure welding or gas pressure
welding may be carried out for two pieces of reinforcing steel bars with the same
diameter and different designations; the designation of reinforcing steel bar shall be
within the range specified in Table 4.1.1 of this Specification. Welding rod, welding wire
and welding parameters shall be selected according to the reinforcing steel bar with
higher designation; and the butt joint strength shall be calculated according to the
strength of reinforcing steel bar with lower designation.
4.1.11 Where the ambient temperature is less than -20°C, various welding shall not be
carried out.
4.1.12 When welding in rainy and snowy days, effective shield measures shall be taken.
Uncooled joint after welding shall not be exposed to rain, ice and snow; effective anti-
skid and anti-electric shock measures shall be taken to ensure personnel safety.
4.1.13 When the air speed in the weld zone is greater than 8m/s, flash butt welding or
shielded metal arc welding is carried out on the site; where the air speed is greater
than 5m/s, gas pressure welding is carried out, and where the air speed is greater than
2m/s, the carbon-dioxide arc welding is carried out, wind-shielding measures shall be
taken.
4.7.5 When solid-state gas pressure welding is adopted, the welding procedures shall
comply with the following provisions.
4.8.2 Submerged-arc pressure welding procedure shall comply with the following
provisions.
4.8.3 Submerged-arc pressure welding parameters shall include arc initiation lifting
height, arc voltage, welding current and weld energizing time.
4.8.4 In submerged-arc pressure welding production, procedures such as arc initiation,
arcing (the reinforcing steel bars maintains at original position or slowly lowered) and
jacking shall be closely coordinated with each other; the welding ground wire shall be
tightly contacted with the copper plate electrode; rust and contaminants in electrode
jaw shall be eliminated timely and the shape of electrode jaw shall be repaired.
4.9 Submerged-arc stud welding of reinforcing steel bar at prefabricated
components
4.9.1 Submerged-arc stud welding equipment of reinforcing steel bar at prefabricated
components shall include submerged-arc stud welder, welding gun, welding cable,
control cable and bar chuck.
4.9.2 Submerged-arc stud welder shall be consisted of thyristor rectifier and regulation-
control system and provided with multiple models; in the production, they shall be
selected according to Table 4.9.2.
4.9.3 Submerged-arc stud welding gun shall be provided with electromagnet-lifting and
motor-dragging types; in the production, the welding gun shall be selected according
to the diameter and length of the reinforcing steel bar.
5 Quality Inspection and Acceptance
5.1 General requirements
5.1.1 Quality inspection and acceptance shall be carried out according to inspection
lots for welded joints of reinforcing steel bar or welded products (welded frame and
welded fabric). Division of inspection lots shall comply with the provisions of
subclauses 5.2~5.8 in this Specification. Quality inspection and acceptance shall cover
appearance quality inspection and mechanical property inspection; and it shall be
classified into dominant items and general items.
5.1.7 For tensile tests for flash butt welded joint, arc welded joint, electroslag
pressure welded joint, gas pressure welded joint and flash butt welded joint of
stirrup of reinforcing steel bar as well as T-joint of reinforcing steel bar at
prefabricated components, three joints shall be randomly cut from each
inspection lot of joints for test and the test results shall be rated according to
the following provisions.
5.2 Welded frame and welded fabric of reinforcing steel bar
5.2.1 Only appearance quality inspection is carried out for inspection lots of welded
frame and welded fabric that are not specially specified according to the following
provisions.
5.2.2 Appearance quality inspection results of welded frames shall meet the following
provisions.
5.2.3 Overall dimension inspection and appearance quality inspection results of
welded fabric shall comply with the following provisions.
5.3 Flash butt welded joint of reinforcing steel bar
5.3.1 For quality inspection of flash butt welded joint, appearance quality inspection
and mechanical property inspection shall be carried out in lots, and shall comply with
the following provisions.
5.6 Electroslag pressure welded joint of reinforcing steel bar
5.6.1 For quality inspection of electroslag pressure welded joint, appearance quality
inspection and mechanical property inspection shall be carried out in lots and shall
comply with the following provisions.
5.7 Gas pressure welded joint of reinforcing steel bar
5.7.1 For quality inspection of gas pressure welded joint, appearance quality inspection
and mechanical property inspection shall be carried out in lots and shall comply with
the following provisions.
6 Examination of Weldor
6.0.1 The weldor engaged in welding of reinforcing steel bars must be provided
with bar weldor examination certificate and shall take up his/her post to operate
according to range specified in the certificate.
6.0.2 Both weldors after the completion of professional training and with independent
welding capacity shall take a bar weldor examination.
6.0.6 Reinforcing steel bar, welding rod, flux, oxygen, dissolved acetylene, liquefied
petroleum gas and carbon dioxide gas for weldor's operating skill examination shall
comply with the provisions of this Specification; the welding equipment may be
determined according to specific conditions.
6.0.9 For weldors with certificates, during the welding production, in case of two lots of
unqualified products within three months, the qualifications shall be cancelled.
6.0.10 Weldors with certificates shall take a reexamination every two years. Where
they are away from the welding post for over half a year, they shall take a
reexamination before the production operation. Operating skill examination may only
be carried out for the reexamination.
7 Welding Safety
7.0.1 Safety training and personnel management shall comply with the following
provisions.
7.0.2 Welding operators and the assistants shall wear labor protection articles
according to the following requirements and in combination with actual conditions.
7.0.3 Prevention for welding work area shall comply with the following provisions.
7.0.7 Where the welding operation is carried out in an enclosed space, specific
personnel shall be arranged for monitoring.
7.0.8 Damage of oxygen cylinder, dissolved acetylene cylinders or liquefied petroleum
gas cylinder, dry tempering preventer, decompressor and rubber hose shall be avoided.
Any discovered failure of pressure gauge pointer as well as leakage of cylinder valve
and rubber hose shall be immediately repaired or replaced. Regular inspection must
be carried out for gas cylinders. At the expiration of its service life or unqualified one in
the inspection, it is prohibited to continue in service.
7.0.10 During storage, use and handling of oxygen cylinders, dissolved acetylene
cylinders, liquefied petroleum gas cylinders and carbon dioxide gas cylinders, they
shall be carried out respectively according to Specifications for Safety Supervision of
Gas Cylinders issued by the former State Bureau of Quality and Technical Supervision
and Specifications for Safety Supervision of Dissolved Acetylene Cylinders issued by
the former Ministry of Labor.
JGJ
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
Record No.. J 253-2012
P JGJ 18-2012
Specification for Welding and Acceptance of
Reinforcing Steel Bars
Issued on. MARCH 01, 2012
Implemented on. AUGUST 01, 2012
Issued by. Ministry of Housing and Urban-Rural Development of the
People’s Republic of China
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Specification for Welding and Acceptance of
Reinforcing Steel Bars
Approved by. Ministry of Housing and Urban-Rural Development of the People’s
Republic of China
Implemented on. AUGUST 01, 2012
2012 Beijing
Table of Contents
Foreword... 6
1 General Provisions... 8
2 Terms and Symbols... 8
2.1 Terms... 8
2.2 Symbols... 11
3 Materials... 14
4 Welding of Reinforcing Steel Bar... 16
4.1 Basic provisions... 16
4.2 Resistance spot welding of reinforcing steel bar... 21
4.3 Flash butt welding of reinforcing steel bar... 22
4.4 Flash butt welding of stirrup... 25
4.5 Arc welding of reinforcing steel bar... 27
4.6 Electroslag pressure welding of reinforcing steel bar... 33
4.7 Gas pressure welding of reinforcing steel bar... 36
4.8 Submerged-arc pressure welding of reinforcing steel bar at prefabricated
components... 38
4.9 Submerged-arc stud welding of reinforcing steel bar at prefabricated
components... 40
5 Quality Inspection and Acceptance... 42
5.1 General requirements... 42
5.2 Welded frame and welded fabric of reinforcing steel bar... 46
5.3 Flash butt welded joint of reinforcing steel bar... 48
5.4 Flash butt welded joint of stirrup... 49
5.5 Arc welded joint of reinforcing steel bar... 49
5.6 Electroslag pressure welded joint of reinforcing steel bar... 51
5.7 Gas pressure welded joint of reinforcing steel bar... 52
5.8 T-joint of reinforcing steel bar at prefabricated components... 53
6 Examination of Weldor... 55
7 Welding Safety... 59
Appendix A Quality Acceptance Record of Welded Joints Inspection Group of
Reinforcing Steel Bar... 62
Appendix B The Certificate of Weldor Examination for Reinforcing Steel Bar 69
Explanation of Wording in This Specification... 72
List of Quoted Standards... 73
1 General Provisions
1.0.1 This Specification was formulated with a view to adopting reasonable welding
procedure and unified quality acceptance criteria, achieving construction safety,
guaranteeing quality, advanced technology, material and energy conservation in the
welding procedure of reinforcing steel bars.
1.0.2 This Specification is applicable to welding procedure of reinforcing steel bars and
the quality inspection and acceptance in generally industrial and civil construction
engineering concrete structure.
1.0.3 Welding procedure of reinforcing steel bar and the quality inspection and
acceptance shall not only be carried out according to this Specification, but also comply
with the provisions of relevant current national standards.
2 Terms and Symbols
2.1 Terms
2.1.1 Hot rolled plain bars
Finished reinforcing steel bar that is formed by hot rolling, generally with circular cross
section and smooth surface.
2.1.2 Hot rolled bars
Reinforcing steel bar that is delivered according to hot-rolled state, whose
metallographic structures are mainly ferrite and pearlite and shall be free from other
microstructures (such as tempered martensite microstructure on base circle) with
influence on service performance.
2.1.3 Hot rolled bars of fine grains
Reinforcing steel bar of fine grains that is formed through controlled rolling and cooling
process in the hot-rolled process, whose metallographic structures are mainly ferrite
and pearlite and shall be free from other microstructures (such as tempered martensite
microstructure on base circle) with influence on service performance; their grain size
shall be no greater than Grade 9.
2.1.4 Quenching and self-tempering ribbed steel bars
Finished reinforcing steel bar that is obtained through surface-controlled cooling in
utilization of heat treatment principle after hot rolling and completion of tempering in
utilization of residual heat of the core itself. Quenching and self-tempering ribbed steel
bars have a diversity of designations; where the welding is necessary, RRB400W
weldable quenching and self-tempering ribbed steel bars shall be selected.
2.1.9 Flash butt welding of stirrup
A kind of pressure welding method that both ends of waiting weld stirrup are placed on
the butt welder in butting form; intense flash and splash are generated in utilization of
resistance heat to melt metal at the contact point; then an upset force is rapidly applied,
and closed-loop stirrup is formed by welding.
2.1.10 Shielded metal arc welding of reinforcing steel bar
A kind of fusion welding method that welding rod is regarded as one electrode and
reinforcing steel bar as another electrode; and welding is carried out through produced
arc heat in utilization of welding current.
2.1.11 Carbon-dioxide arc welding of reinforcing steel bar
A kind of fusion welding method that welding wire is regarded as one electrode and
reinforcing steel bar as another electrode; and carbon dioxide gas is regarded as arc
medium to protect metal drop, welding pool and hot metal in weld zone. Carbon-dioxide
arc welding is hereinafter referred to as CO2 welding.
2.2 Symbols
2.2.1 Symbols of reinforcing steel bar.
3 Materials
3.0.1 Chemical composition and mechanical property of welded reinforcing steel bar
shall comply with the provisions of relevant current national standard.
3.0.2 Low carbon steel or low alloy steel may be adopted for steel plates and section
steel in welded joint of reinforcing steel bar at prefabricated components as well as
molten tank auxiliary rod and groove welded joint; and the mechanical property and
chemical composition shall comply with the provisions of the current national standards
Carbon Structural Steels (GB/T 700) or High Strength Low Alloy Structural Steels
(GB/T 1591).
3.0.5 Among electroslag pressure welding as well as submerged-arc pressure welding
and submerged-arc stud welding of reinforcing steel bar at prefabricated components,
HJ 431 fused flux may be adopted; in submerged-arc stud welding, SJ101 fluorine-
alkali agglomerated flux may also be adopted.
3.0.6 Welded reinforcing steel bars and steel plates shall be provided with quality
certificate; welding rods, welding wire, oxygen, dissolved acetylene, liquefied
petroleum gas, carbon dioxide gas and flux shall be provided with product
certificate.
3.0.7 Welding materials shall be sorted for storage, and handled appropriately; the
measures against rust and deterioration through moisture shall be taken.
4 Welding of Reinforcing Steel Bar
4.1 Basic provisions
4.1.1 During welding of reinforcing steel bar, application scope of welding methods
shall comply with the provisions specified in Table 4.1.1.
4.1.2 Electroslag pressure welding shall be used for connection of vertical stressed
bars in cast-in-place concrete structures for structures such as column and wall; and
shall not be used for connection of horizontal reinforcing steel bar in the members such
as beam and plate.
4.1.3 Before commencement of welding in reinforcement works, the weldors
who participate must go through welding procedure test under site conditions
and can use it for welding production after the test qualification.
4.1.7 Flash butt welding, electroslag pressure welding or gas pressure welding may be
carried out for two pieces of reinforcing steel bars with the same designation and
different diameters. Where the flash butt welding is carried out, diameter difference of
reinforcing steel bar shall be no greater than 4mm;
4.1.8 Flash butt welding, arc welding, electroslag pressure welding or gas pressure
welding may be carried out for two pieces of reinforcing steel bars with the same
diameter and different designations; the designation of reinforcing steel bar shall be
within the range specified in Table 4.1.1 of this Specification. Welding rod, welding wire
and welding parameters shall be selected according to the reinforcing steel bar with
higher designation; and the butt joint strength shall be calculated according to the
strength of reinforcing steel bar with lower designation.
4.1.11 Where the ambient temperature is less than -20°C, various welding shall not be
carried out.
4.1.12 When welding in rainy and snowy days, effective shield measures shall be taken.
Uncooled joint after welding shall not be exposed to rain, ice and snow; effective anti-
skid and anti-electric shock measures shall be taken to ensure personnel safety.
4.1.13 When the air speed in the weld zone is greater than 8m/s, flash butt welding or
shielded metal arc welding is carried out on the site; where the air speed is greater
than 5m/s, gas pressure welding is carried out, and where the air speed is greater than
2m/s, the carbon-dioxide arc welding is carried out, wind-shielding measures shall be
taken.
4.7.5 When solid-state gas pressure welding is adopted, the welding procedures shall
comply with the following provisions.
4.8.2 Submerged-arc pressure welding procedure shall comply with the following
provisions.
4.8.3 Submerged-arc pressure welding parameters shall include arc initiation lifting
height, arc voltage, welding current and weld energizing time.
4.8.4 In submerged-arc pressure welding production, procedures such as arc initiation,
arcing (the reinforcing steel bars maintains at original position or slowly lowered) and
jacking shall be closely coordinated with each other; the welding ground wire shall be
tightly contacted with the copper plate electrode; rust and contaminants in electrode
jaw shall be eliminated timely and the shape of electrode jaw shall be repaired.
4.9 Submerged-arc stud welding of reinforcing steel bar at prefabricated
components
4.9.1 Submerged-arc stud welding equipment of reinforcing steel bar at prefabricated
components shall include submerged-arc stud welder, welding gun, welding cable,
control cable and bar chuck.
4.9.2 Submerged-arc stud welder shall be consisted of thyristor rectifier and regulation-
control system and provided with multiple models; in the production, they shall be
selected according to Table 4.9.2.
4.9.3 Submerged-arc stud welding gun shall be provided with electromagnet-lifting and
motor-dragging types; in the production, the welding gun shall be selected according
to the diameter and length of the reinforcing steel bar.
5 Quality Inspection and Acceptance
5.1 General requirements
5.1.1 Quality inspection and acceptance shall be carried out according to inspection
lots for welded joints of reinforcing steel bar or welded products (welded frame and
welded fabric). Division of inspection lots shall comply with the provisions of
subclauses 5.2~5.8 in this Specification. Quality inspection and acceptance shall cover
appearance quality inspection and mechanical property inspection; and it shall be
classified into dominant items and general items.
5.1.7 For tensile tests for flash butt welded joint, arc welded joint, electroslag
pressure welded joint, gas pressure welded joint and flash butt welded joint of
stirrup of reinforcing steel bar as well as T-joint of reinforcing steel bar at
prefabricated components, three joints shall be randomly cut from each
inspection lot of joints for test and the test results shall be rated according to
the following provisions.
5.2 Welded frame and welded fabric of reinforcing steel bar
5.2.1 Only appearance quality inspection is carried out for inspection lots of welded
frame and welded fabric that are not specially specified according to the following
provisions.
5.2.2 Appearance quality inspection results of welded frames shall meet the following
provisions.
5.2.3 Overall dimension inspection and appearance quality inspection results of
welded fabric shall comply with the following provisions.
5.3 Flash butt welded joint of reinforcing steel bar
5.3.1 For quality inspection of flash butt welded joint, appearance quality inspection
and mechanical property inspection shall be carried out in lots, and shall comply with
the following provisions.
5.6 Electroslag pressure welded joint of reinforcing steel bar
5.6.1 For quality inspection of electroslag pressure welded joint, appearance quality
inspection and mechanical property inspection shall be carried out in lots and shall
comply with the following provisions.
5.7 Gas pressure welded joint of reinforcing steel bar
5.7.1 For quality inspection of gas pressure welded joint, appearance quality inspection
and mechanical property inspection shall be carried out in lots and shall comply with
the following provisions.
6 Examination of Weldor
6.0.1 The weldor engaged in welding of reinforcing steel bars must be provided
with bar weldor examination certificate and shall take up his/her post to operate
according to range specified in the certificate.
6.0.2 Both weldors after the completion of professional training and with independent
welding capacity shall take a bar weldor examination.
6.0.6 Reinforcing steel bar, welding rod, flux, oxygen, dissolved acetylene, liquefied
petroleum gas and carbon dioxide gas for weldor's operating skill examination shall
comply with the provisions of this Specification; the welding equipment may be
determined according to specific conditions.
6.0.9 For weldors with certificates, during the welding production, in case of two lots of
unqualified products within three months, the qualifications shall be cancelled.
6.0.10 Weldors with certificates shall take a reexamination every two years. Where
they are away from the welding post for over half a year, they shall take a
reexamination before the production operation. Operating skill examination may only
be carried out for the reexamination.
7 Welding Safety
7.0.1 Safety training and personnel management shall comply with the following
provisions.
7.0.2 Welding operators and the assistants shall wear labor protection articles
according to the following requirements and in combination with actual conditions.
7.0.3 Prevention for welding work area shall comply with the following provisions.
7.0.7 Where the welding operation is carried out in an enclosed space, specific
personnel shall be arranged for mo......
Source: Translated/reviewed by www.ChineseStandard.net / Wayne Zheng et al.
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- Payment Agent (Gateway). Select your preferred payment gateway ( www.Stripe.com or www.PayPal.com).
- Invoice. Customize your Tax Invoice by entering your email address and billing details.
- Checkout. Click the "Checkout" button.
- Payment. Complete your payment via Credit Card, PayPal, Google Pay, or Apple Pay (securely processed by/at Stripe.com or PayPal.com).
- Instant Access. Typical delivery time: Less than 9 seconds; see Note 2. Because we utilize real-time asynchronous Webhooks, your order is processed before you even return to our site.
- Download. On the Return Page, click "Download" button to enter into the dedicated download page for securely accessing itemized PDF and Tax Invoice. See Note 3.
- Verification (USD 1.00 Trial). Want to experience our lightning-fast delivery first? Click here to purchase GB 38031-2020 for only USD 1.00 (the minimum checkout amount) to test the full 9-second procedure.
Visual Step-by-Step Screenshots
Reference guide for the steps above (with flowchart): Steps 1~9
Notes and Explanations
Note 1: www.ChineseStandard.us/products/jgj18-2012 is hosted on well-known platform www.Shopify.com. Although the Shopify's purchasing procedure is different, it is deemed as intuitive and self-explained, both PDF and invoice can also be downloaded instantly after the payment.
Note 2: Our "9-second delivery" is powered by the Webhook protocol (first conceptualized by Jeff Lindsay in 2007). Like lightning arriving before thunder, our backend receives your payment confirmation via the 'Technical Edge' before your browser even finishes the redirect (your browser returns to www.ChineseStandard.net from the payment gateway).
Note 3: If you are unable to redirect back to our Return Page, do not worry. Additionally and independently, our automated system will still deliver your PDF and Invoice via email (the second mechanism to ensure the delivery), typically within 3 minutes. Once your payment is complete, you have two instant ways to access your PDF and invoice: you may stay on the Return Page for download in 9 seconds typically, or simply check your email inbox where a copy is automatically delivered in 3 minutes typically.