GB/T 32260.1-2015 English PDF (GBT32260.1-2015)

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GB/T 32260.1-2015: Destructive tests on welds in metallic materials -- Cold cracking tests for weldments -- Arc welding processes -- Part 1: General
GB/T 32260.1-2015
Destructive tests on welds in metallic materials - Cold cracking tests for weldments - Arc welding processes - Part 1. General
ICS 25.160.40
J33
National Standards of People's Republic of China
Cold welds in metallic materials destructive test weldment
Welding crack Test methods - Part 1. General
weldments-Arcweldingprocesses-Part 1. General
(ISO 17642-1.2004, MOD)
Issued on. 2015-12-10
2016-07-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 32260 "cold crack test welds in metallic materials welding methods Destructive tests weldment" is divided into three parts.
--- Part 1. General;
--- Part 2. Self-restraint tests;
--- Part 3. external load test.
This section GB/T Part of 132,260.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This section uses redrafted Law Amendment uses ISO 17642-1.2004 "Destructive tests on welds in metallic materials weldment cold cracks
Arc test methods - Part 1. General. "
This part of ISO 17642-1.2004 technical differences and their reasons are as follows.
--- On normative references, this part has been adjusted technical differences, in order to adapt our technical conditions. Adjustment situation
Focus is reflected in the status of Chapter 2, "Normative references", the specific adjustments are as follows.
● increase the GB/T 3375 "Welding terms";
● The ISO 17642-1.2005 standard of international and European standards cited, instead of using the corresponding standard.
This part of the National Welding Standardization Technical Committee (SAC/TC55) and focal points.
This section is drafted. Shanghai Institute of Special Equipment Inspection, Harbin Institute of Welding, Laser Technology, Dongguan future there
Limited, China Special Equipment Inspection and Research Institute, Tianjin Golden Bridge Welding Materials Group Co., Ltd., Chinese Academy of Oil and Gas Pipeline.
Drafters of this section. Xu Bin, Su Golden, Europe Xiao Jun, Wang Kenan, Shi Kun, Yang Yongmei, Sui Yongli, Pudong Guang.
Cold welds in metallic materials destructive test weldment
Welding crack Test methods - Part 1. General
1 Scope
GB/T 32260 provisions of this part of the basic terms, definitions and principles of cold cracking tests.
This section applies to the qualification of welding materials, cold cracking susceptibility of base metal and welded joints.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 3375 Welding terminology
Cold welding crack test methods - Part 2 GB/T 32260.2 Destructive tests on welds in metallic materials weldment. Self-restraint
Test (GB/T 32260.2-2015, ISO 17642-2.2005, MOD)
Cold welding crack test method GB/T 32260.3 Destructive tests on welds in metallic materials weldments - Part 3. external load
Test (GB/T 32260.3-2015, ISO 17642-3.2005, MOD)
3 Terms and Definitions
GB/T 3375 defined by the following terms and definitions apply to this document.
3.1
Cold crack coldcracks
Welded joint is cooled to lower temperatures (for steel, in the Ms temperature or less) generated during welding cracks. Cold cracking is due to the significant
Microstructure, stress and hydrogen content caused by the combined effects of local cracking (intragranular or transgranular cracking).
Note. The cold cracking, also known as hydrogen cracking or delayed cracking.
3.2
Cold cracking test procedures coldcrackingtestprocedures
Associated with the use of welding procedures for determining the base metal, weld metal and welded joints cold cracking susceptibility of the program.
3.3
Self-restraint tests selfrestrainttests
During the test, the test load from the restraint weld test pieces.
3.4
External load test externalyloadedtests
During the test, the test load during the test specimens from the externally applied load.
4 Fundamentals
After completion of the cooling, the microstructure, stress and hydrogen content of the additional conditions reached a critical state weldment cold cracking occurs.
--- Mainly it determined by the microstructure and chemical composition (cooling time 800 ℃ ~ 500 ℃ between) t8/5;
--- Mainly due to the additional stress of potential stress level (ie, the yield strength of the material), after restraint stress and welding operations in the vicinity of the weld production
Health effects of shrinkage stress;
--- Depending on the hydrogen content of the skin due to the drug or moisture flux, preheat, interpass temperature and holding temperature hydrogen absorption due to diffusion.
Note. For Ac1 transformation temperature far below 500 ℃ steel, generally consider the cooling time 700 ℃ ~ 300 ℃ between.
In the cold crack test procedures, test stress test completely self restraint provided by the restraint weld. Test types and main applications are shown in Table 1.
External load test stress test by a suitable means for applying an external load. Test and its application are shown in Table 2.
Table 1 Self-restraint tests (see GB/T 32260.2) and its application
Test the type of application
Control hot strength test
(CTS test)
Tekken test
(Oblique Y-groove test)
Caspian test
(U shaped groove test)
Qualification of welding materials, base metals and welding processes.
determine.
--- Minimum heat input;
--- Lowest preheating temperature;
--- Lowest temperature after the heat;
--- Diffusion limit hydrogen content
Note. These procedures gives a qualitative (cracked/non-cracked) or quantitative (rate of crack/no crack limit) assessment.
Table 2 external load test (see GB/T 32260.3) and its application
Test the type of application
Implant Test welding material, the base material evaluation test.
determine.
--- Minimum heat input;
--- Lowest preheating temperature;
--- Minimum temperature between channels;
--- Lowest temperature after the heat;
--- Diffusion limit hydrogen content;
--- Critical stress
Note. These procedures gives a qualitative (cracked/non-cracked) or quantitative (rate of crack/no crack limit) assessment.