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JB/T 5943-2018: (Engineering machinery, general technical conditions for heat treatment parts)
Status: Valid JB/T 5943: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JB/T 5943-2018 | English | 419 |
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(Engineering machinery, general technical conditions for heat treatment parts)
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JB/T 5943-2018
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| JB/T 5943-1991 | English | 195 |
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Engineering machinery General technical specifications for weldments
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JB/T 5943-1991
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PDF similar to JB/T 5943-2018
Basic data | Standard ID | JB/T 5943-2018 (JB/T5943-2018) | | Description (Translated English) | (Engineering machinery, general technical conditions for heat treatment parts) | | Sector / Industry | Mechanical & Machinery Industry Standard (Recommended) | | Classification of Chinese Standard | P97 | | Word Count Estimation | 18,149 | | Date of Issue | 2018-07-04 | | Date of Implementation | 2019-05-01 | | Older Standard (superseded by this standard) | JB/T 5943-1991 | | Regulation (derived from) | Ministry of Industry and Information Technology Announcement No.36 of 2018 | | Issuing agency(ies) | Ministry of Industry and Information Technology | | Summary | This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of welded parts in construction machinery products. This standard applies to welded parts of manual arc welding, submerged arc welding and gas shielded welding. | JB/T 5943-1991
MACHINERY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
P 97
Engineering Machinery -
General Technical Specifications for Weldments
ISSUED ON: DECEMBER 12, 1991
IMPLEMENTED ON: JULY 01, 1992
Issued by: Ministry of Machine-Electronics Industry of PRC
Table of Contents1 Subject Contents and Applicable Scope ... 3
2 Normative References ... 3
3 Technical Requirements ... 4
4 Test Method ... 18
5 Inspection Rules ... 20
6 Marking, Package, Transportation and Storage ... 21
Additional Information: ... 21
Engineering Machinery -
General Technical Specifications for Weldments
1 Subject Contents and Applicable Scope
This Standard specifies the technical requirements, test methods, inspection rules,
marking, package, transportation and storage of the weldments in the engineering
machinery products.
This Standard is applicable to the weldments for manual arc welding, submerged arc
welding and gas-shielded welding.
Normative ReferencesGB 985 Basic Forms and Sizes of Weld Grooves for Gas Welding, Manual Arc
Welding and Gas-Shielded Arc Welding
GB 986 Basic Forms and Sizes of Weld Grooves for Submerged Arc Welding
GB 1804 Tolerance and Fitting
GB 2650 Impact Test Methods on Welded Joints
GB 2651 Methods of Tensile Test for Welded Joints
GB 2652 Tensile Test Methods on Weld and Deposited Metal
GB 2653 Methods of Bend and Compression Tests for Welded Joint
GB 2654 Methods of Hardness Tests for Welded Joint and Surfacing Metal
GB 2655 Method of Stain-Age Sensibility Test for Welded Joint
GB 2656 Weld beads metal and welds – Fatigue Tests
GB 2828 Sampling Procedures and Tables for Lot-by-Lot Inspection by Attributes
(Apply to Inspection of Successive Lots or Batches)
GB 3323 Methods for Radiographic Inspection and Classification of Radiographs
for Fusion Welded Butt Joints in Steel
Table 13 Unit: mm
3.4.4 Before welding, the rust, oil, paint, dust and other dirt on the surface of the
welded structure shall be removed within a certain range from the edge of the
weld-seam (no less than 10mm for manual welding; and no less than 20mm for
submerged arc welding); and the moist there shall be removed also.
3.5 Welding requirements
3.5.1 The welding work shall be carried out after the installing inspection is
qualified.
3.5.2 The welding rod, welding specification and welder requirements for the
positioning welding during the installing period shall be the same as the formal
welding.
3.5.3 The welding process for the new steel grade, new welding rod, and welding
wire used for the first time must be tested before the formal welding. After
assessing qualified, the welding can be carried out.
3.5.4 It is forbidden to start the arc in the non-weld-seam area, nor to start the
arc at the end of the weld-seam.
3.5.5 The welding operation shall conform to the provisions of GB 9448.
3.6 Post-weld requirements
3.6.1 The limit deviation of the undeclared tolerance size on the non-machined
surface of the weldments shall conform to the provisions of Table 14.
Section height Offset no greater than
3.6.7 The undeclared tolerance for the perpendicularity and parallelism between
the surfaces of the weldments shall not exceed half maximum tolerance of the
corresponding dimensions (see Figure 8).
3.6.8 The undeclared tolerance for the symmetry between the surfaces of the
weldments shall not exceed the half tolerance for the corresponding reference
surface (see Figure 9).
Figure 8 Figure 9
3.6.9 Correction of the welding deformation: correction shall be carried out in the
hot state; generally, it is not allowed to be carried out at the blue-brittle
temperature (250~500°C) (except for the quenched and tempered steel). The
correction in the cold state shall not be carried out at the cold-brittle temperature
(-20°C).
When using flame for correction, it is strictly forbidden to repeat the heating at
the same position to prevent the changes in the fields of metallographic structure
and mechanical properties. For the important parts, it is strictly forbidden to use
the rapid cooling method such as water cooling, air cooling; it is also not allowed
to perform the repeated correction of the tensile and compressive stress in the
same position. After correction, the surface of the weldments shall be free of
cracks, craters and other defects that affect the strength and appearance of the
weldment.
3.6.10 Weld-seam surface quality classification and its shape deviation and
external defects
3.6.10.1 The weld-seam surface quality classification shall conform to the
provisions of Table 16.
3.6.10.2 The weld-seam shape deviation and external defects shall conform to
the provisions of Table 17.
4.5.2.1 During the water pressure test, the temperature of the ambient air and
the test water shall be more than +5°C; otherwise, take the anti-freezing
measures.
4.5.2.2 The internal shall be cleaned up before water filling. Discharge all the air
inside the test piece during the water filling. The condensation on the outer
surface of the container shall be removed after water filling.
4.5.2.3 The test pressure for the water pressure test shall be no less than 1.5
times of the working pressure.
4.5.2.4 When the pressure reaches the test pressure, the dwell time shall be no
less than 5min; during this time, the fluctuation of the gauge pressure is allowed,
but no less than the test pressure. If leakage or moisture is found on the weld-
seam, the defective positions shall be removed and re-welded, then carry out the
test.
4.5.2.5 During the test, the weld-seam is not allowed to be repaired; nor the weld-
seam is allowed to be struck.
4.5.2.6 After the test is completed, the water shall be discharged completely.
4.6 Mechanical properties test of weld-seam
a) The impact test of the welding joint shall be carried out as per the provisions
of GB 2650;
b) The tensile test of the welding joint shall be carried out as per the provisions
of GB 2651;
c) The tensile test of the weld-seam metal shall be carried out as per the
provisions of GB 2652;
d) The bending and flattening test of the welding joint shall be carried out as
per the provisions of GB 2653;
e) The hardness test of the welding joint shall be carried out as per the
provisions of GB 2654;
f) The strain aging sensitivity test of the welding joint shall be carried out as
per the provisions of GB 2655;
g) The fatigue test of the weld-seam metal and welding joint shall be carried
out as per the provisions GB 2656.
5 Inspection Rules
5.1 The weldments shall be inspected and accepted by the manufacturer’s
quality inspection department according to the drawings, relevant technical
documents and this Standard.
5.2 The geometry and dimensions of the weldments and external defects of the
weld-seam shall be inspected according to the requirements of 3.6.1~3.6.11.
Important weldments shall be checked for geometry and dimensions and
external weld-seam defects on a piece-by-piece basis. The ordinary weldments
shall be randomly inspected for the external weld-seam defects, geometry and
dimension on a piece-by-piece basis; the random inspection method shall be
specified by the manufacturer according to the product batch amount and quality
level, as well as product technical standard and ordering technical requirements
in GB 2828.
5.3 The internal defect test, sealability test, radiographic flaw detection, and
mechanical properties of the weld-seams shall be carried out according to the
drawing and ordering technical requirements.
5.4 Borehole inspection of the weld-seam
5.4.1 Borehole inspection can be carried out in case one of the following
conditions:
a) On one side of the weld-seam, there is undercut; on the other side, there is
weld-flash;
b) Multiple air pores and shrinkage holes on the surface of the weld-seam;
c) The weld-seam has a significantly uneven weld-wave;
d) Other abnormal phenomena are found outside the weld-seam; and the
quality inspection department considers necessary.
5.4.2 The position and quantity of the boreholes are determined by the quality
inspection department.
5.4.3 When the width of the weld-seam is less than or equal to 20mm, the
diameter of the drill must be such that the cross-section of the weld-seam is cut;
include the base metal on each side of 1~1.5mm. When the width of the weld-
seam is greater than 20mm, the hole can be drilled on the weld-seam till to the
fusion zone.
5.4.4 When weld-seam quality is found inconsistent with the requirements during
the drilling inspection, re-drill holes to determine the defect boundary; the defect
position shall be removed and re-welded; double the drilling inspection after
welding. If no defects that do not meet the requirements are found, the drilled
holes must be welded completely.
5.5 The length of the weld-seam through the radiographic flaw detection shall be
no less than 30% entire length of the weld-seam. When defects are found, the
supplementary fluoroscopic-test shall be made around the original defects; the
supplementary fluoroscopic length shall be equal to the length of the
fluoroscopic-test position of the weld-seam. If defects are found in the
supplementary fluoroscopic-test, all weld-seams shall be fluoroscopic-tested.
5.6 Weld-seams that are assess unqualified shall be returned for repair after
approval by the quality inspection department. The maximum number of
returning for repair shall be no more than twice. It is forbidden to repair with
caulking, oxygen block flame blowing and deposit welding.
6 Marking, Package, Transportation and Storage
6.1 The weldments that is inspected qualified shall be attached with the mark of
the manufacturer’s quality inspection department on the non-machined surface.
6.2 The weldments shall be attached with certificate when leaving the factory,
where the following contents shall be indicated:
a) Manufacturer’s name and code;
b) Weldment name and drawing number (ordering contract number);
c) Quantity;
d) Inspection and test results.
6.3 The package, transportation and storage of the weldments shall conform to
the provisions of relevant standards and ordering agreements.
Additional Information:
This Standard was proposed by and under the jurisdiction of Tianjin Research
Institute of Construction Machinery under Ministry of Machine-Building and
Electronics Industry.
Drafting organization of this Standard: Tianjin Research Institute of Construction
Machinery under Ministry of Machine-Building and Electronics Industry.
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