JB/T 10375-2002 PDF English
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Recommended practice for vibration stress relief on welding structure
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JB/T 10375-2002: Recommended practice for vibration stress relief on welding structure---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JBT10375-2002
JB
MECHANICAL INDUSTRY STANDARD
ICS 25.160.10
J 33
Recommended practice for vibration
stress relief on welding structure
Issued on. DECEMBER 27, 2002
Implemented on. APRIL 1, 2003
Issued by. State Economy and Trade Commission of the People’s
Republic of China
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Selection of vibration stress relief device... 6
5 Selection of technical parameters and technical requirements... 7
6 Method for evaluating the effects of vibration stress relief... 10
Annex A (Informative) Description of applications of vibration stress relief
... 13
Foreword
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee on
Welding of Standardization Administration of China.
The drafting organizations of this Standard. Harbin Welding Institute, Sichuan Liying
Technology Co., Ltd., Heilongjiang Hailun Vibration Stress Relief Co., Ltd., Xi'an
University of Technology, Shanghai Jiaotong University.
The main drafters of this Standard. Li Qingben, Zhang Yong, Han Dianwen, Feng
Baoyu, Xu Yang, Chen Ligong.
Recommended practice for vibration
stress relief on welding structure
1 Scope
This Standard the recommended practice for vibration stress relief on welding structure,
including the selection of technical parameters, the technical requirements and the
method for evaluation of vibration stress relief effects.
This Standard applies to the vibration stress relief on fusion welding structures of
carbon structural steel, low alloy steel, stainless steel, copper and copper alloys,
titanium and titanium alloys.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigenda) or revisions do not apply to this Standard, however, parties who
reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
JB/T 5925.2, Machinery vibrating stress relief device – Part 2.Technical
requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
exciting point
A point to which force is applied to a structure during vibration stress relief is called an
exciting point.
3.2
support point
A position of a supporting structure which is chosen to provide vibration stress relief
for a structure.
3.3
dynamic stress
The stress which is generated in a structure when an exciting force produces resonant
responses, is called dynamic stress. The symbol of the vector is σd (amplitude), in MPa.
3.4
resonance
The phenomenon, that the amplitude of a structure increases rapidly when the
frequency of the periodic exciting force provided by an exciting force is close or equal
to the inherent frequency of the system, is called resonance.
3.5
vibration mode
During resonance, the vibrating envelope lines of all mass points on the surface of a
structure, are vibration mode, including bent, twisted, distorted, clock vibration modes
and drum vibration mode.
4 Selection of vibration stress relief device
When vibration stress is relieved on a welding structure, the vibration stress relief
device used shall be as required by JB/T 5925.2 and have the following functions.
5 Selection of technical parameters and technical requirements
5.1 Parameter determination criteria
Under general conditions, the vibration parameters shall be determined by analyzing
and estimating the possible vibration modes within the excitation frequency of a
structure based on the working conditions of the welding structure.
5.2 Direct vibration
A structure can be vibrated directly within the excitation frequency range if responses
can be excited.
5.2.1 Support of a structure
For the structure which can be vibrated directly, an elastic support and be placed at
the node in accordance with the vibration mode obtained from analysis and estimation.
Support points can be two, three or four.
The support of special structures stable.
5.3 Indirect vibration
For a structure which cannot be vibrated directly, frequency reduction measures shall
be taken. The main frequency reduction measures include cantilever, series
connection and combination and so on.
5.4 Trial vibration of a structure
5.4.1 General rules
When vibration stress relief is carried out for welding structures of other materials, first
carry out an evaluation of similar materials and processes.
If the dimensions of a welding structure’s defects exceed the limits or the constructions
of a welding structure are designed inappropriately, vibration stress relief is not allowed.
5.4.5 Dynamic stress
The amplitude of dynamic stress shall achieve 1/3 ~ 2/3 of the working stress of a
structure.
6 Method for evaluating the effects of vibration stress relief
6.1 Parameter curve observation method
The actual effects of vibration stress relief can be estimated in accordance with the
changes of the a-t curve and the changes of the a-n curve before and after vibration,
which are printed in real time during the process of vibration stress relief.
In one of the following cases, it can be decided that vibration stress relief is effective.
6.2 Actual measurement method
6.2.1 Residual stress measurement method
The blind hole relaxation method is recommended; the X-ray diffraction method can be
used, or the magnetic method can be used if possible.
6.2.2 Dimensional accuracy stability test
The welding structures for vibration stress relief which are mainly subjected to
dimensional stability testing, their dimensions shall be measured after vibration. The
specific method of dimension testing shall be as follows.
Annex A
(Informative)
Description of applications of vibration stress relief
A.1 Vibration stress relief of other types of welding structures
This Standard prescribes a limit to the applicable scope of vibration stress relief, but
the specifications of this Standard can be referred to for other types of joints or
structures (e.g.. brazed structures using undermatching joints and diffusion welding
structures) in vibration stress relief.
A.2 Stress concentration factor of welding joints
For the welding structures for which the vibration stress relief technique is used, select
the types of joints which have a small stress concentration factor, which is generally
not greater than 2.8.For the welding structures which have the welding joint design of
significant stress concentration, including spot welding, plug welding, overlap welding,
non-full penetration welding and so on, the maximum dynamic stress amplitude shall
be limited in accordance with the increase ratio of their stress concentration factor.
A.5 Vibration correction of a structure
A structure of excessive deformation shall be corrected before being subjected to
vibration stress relief; vibration correction can be considered in special occasions.
A.6 Evaluation of the process of vibration stress relief
The evaluation of the process of vibration stress relief is carried out for the important
welding structures and mass-produced structures which are subjected to the vibration
stress relief process. This Standard shall be used to guide the establishment of
vibration stress relief process specifications, quality assurance inspection provisions
and important test procedures of relevant technical documents. The process
specifications of vibration stress relief are determined through the evaluation.
JB/T 10375-2002
JB
MECHANICAL INDUSTRY STANDARD
ICS 25.160.10
J 33
Recommended practice for vibration
stress relief on welding structure
Issued on. DECEMBER 27, 2002
Implemented on. APRIL 1, 2003
Issued by. State Economy and Trade Commission of the People’s
Republic of China
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Selection of vibration stress relief device... 6
5 Selection of technical parameters and technical requirements... 7
6 Method for evaluating the effects of vibration stress relief... 10
Annex A (Informative) Description of applications of vibration stress relief
... 13
Foreword
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee on
Welding of Standardization Administration of China.
The drafting organizations of this Standard. Harbin Welding Institute, Sichuan Liying
Technology Co., Ltd., Heilongjiang Hailun Vibration Stress Relief Co., Ltd., Xi'an
University of Technology, Shanghai Jiaotong University.
The main drafters of this Standard. Li Qingben, Zhang Yong, Han Dianwen, Feng
Baoyu, Xu Yang, Chen Ligong.
Recommended practice for vibration
stress relief on welding structure
1 Scope
This Standard the recommended practice for vibration stress relief on welding structure,
including the selection of technical parameters, the technical requirements and the
method for evaluation of vibration stress relief effects.
This Standard applies to the vibration stress relief on fusion welding structures of
carbon structural steel, low alloy steel, stainless steel, copper and copper alloys,
titanium and titanium alloys.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigenda) or revisions do not apply to this Standard, however, parties who
reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
JB/T 5925.2, Machinery vibrating stress relief device – Part 2.Technical
requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
exciting point
A point to which force is applied to a structure during vibration stress relief is called an
exciting point.
3.2
support point
A position of a supporting structure which is chosen to provide vibration stress relief
for a structure.
3.3
dynamic stress
The stress which is generated in a structure when an exciting force produces resonant
responses, is called dynamic stress. The symbol of the vector is σd (amplitude), in MPa.
3.4
resonance
The phenomenon, that the amplitude of a structure increases rapidly when the
frequency of the periodic exciting force provided by an exciting force is close or equal
to the inherent frequency of the system, is called resonance.
3.5
vibration mode
During resonance, the vibrating envelope lines of all mass points on the surface of a
structure, are vibration mode, including bent, twisted, distorted, clock vibration modes
and drum vibration mode.
4 Selection of vibration stress relief device
When vibration stress is relieved on a welding structure, the vibration stress relief
device used shall be as required by JB/T 5925.2 and have the following functions.
5 Selection of technical parameters and technical requirements
5.1 Parameter determination criteria
Under general conditions, the vibration parameters shall be determined by analyzing
and estimating the possible vibration modes within the excitation frequency of a
structure based on the working conditions of the welding structure.
5.2 Direct vibration
A structure can be vibrated directly within the excitation frequency range if responses
can be excited.
5.2.1 Support of a structure
For the structure which can be vibrated directly, an elastic support and be placed at
the node in accordance with the vibration mode obtained from analysis and estimation.
Support points can be two, three or four.
The support of special structures stable.
5.3 Indirect vibration
For a structure which cannot be vibrated directly, frequency reduction measures shall
be taken. The main frequency reduction measures include cantilever, series
connection and combination and so on.
5.4 Trial vibration of a structure
5.4.1 General rules
When vibration stress relief is carried out for welding structures of other materials, first
carry out an evaluation of similar materials and processes.
If the dimensions of a welding structure’s defects exceed the limits or the constructions
of a welding structure are designed inappropriately, vibration stress relief is not allowed.
5.4.5 Dynamic stress
The amplitude of dynamic stress shall achieve 1/3 ~ 2/3 of the working stress of a
structure.
6 Method for evaluating the effects of vibration stress relief
6.1 Parameter curve observation method
The actual effects of vibration stress relief can be estimated in accordance with the
changes of the a-t curve and the changes of the a-n curve before and after vibration,
which are printed in real time during the process of vibration stress relief.
In one of the following cases, it can be decided that vibration stress relief is effective.
6.2 Actual measurement method
6.2.1 Residual stress measurement method
The blind hole relaxation method is recommended; the X-ray diffraction method can be
used, or the magnetic method can be used if possible.
6.2.2 Dimensional accuracy stability test
The welding structures for vibration stress relief which are mainly subjected to
dimensional stability testing, their dimensions shall be measured after vibration. The
specific method of dimension testing shall be as follows.
Annex A
(Informative)
Description of applications of vibration stress relief
A.1 Vibration stress relief of other types of welding structures
This Standard prescribes a limit to the applicable scope of vibration stress relief, but
the specifications of this Standard can be referred to for other types of joints or
structures (e.g.. brazed structures using undermatching joints and diffusion welding
structures) in vibration stress relief.
A.2 Stress concentration factor of welding joints
For the welding structures for which the vibration stress relief technique is used, select
the types of joints which have a small stress concentration factor, which is generally
not greater than 2.8.For the welding structures which have the welding joint design of
significant stress concentration, including spot welding, plug welding, overlap welding,
non-full penetration welding and so on, the maximum dynamic stress amplitude shall
be limited in accordance with the increase ratio of their stress concentration factor.
A.5 Vibration correction of a structure
A structure of excessive deformation shall be corrected before being subjected to
vibration stress relief; vibration correction can be considered in special occasions.
A.6 Evaluation of the process of vibration stress relief
The evaluation of the process of vibration stress relief is carried out for the important
welding structures and mass-produced structures which are subjected to the vibration
stress relief process. This Standard shall be used to guide the establishment of
vibration stress relief process specifications, quality assurance inspection provisions
and important test procedures of relevant technical documents. The process
specifications of vibration stress relief are determined through the evaluation.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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