This standard applies to the crack test of carbon steel T-joint fillet welds. GB/T 4675.3-1984 Weldability test T-joint weld crack test method GB/T4675.3-1984 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Weldability testing
Method of cracking test for welded tee joint
Weldability testing
Method of cracking test for welded tee jointThis standard applies to the crack test of T-joint fillet welds of carbon steel. Preparation of test piece
The shape and size of the test piece are shown in Figure 1.
Positioning weld
2 Test material
Figure 1 Shape and size of test piece
UDC 621.791.058
.68:620.192
GB 4675.3--84
In principle, the test material is A3 and A3F steel specified in GB700--79 "Technical conditions for ordinary carbon structural steel". 3 Test conditions
3.1 The diameter of the test electrode is 4mm.
3.2S, and Sz welds are welded in the boat-shaped welding position (see Figure 2). Weld Swww.bzxz.net
Weld S
Welding position of test weld
National Bureau of Standards Issued on July 28, 1984
Implementation on May 1, 1985
4 Test steps
GB 4675.3-84
4.1 Place the bottom plate and the vertical plate of the test piece close together and fix them with spot welding at both ends. 4.2 After welding a restraint weld S1, immediately weld a test weld S2 with a thickness smaller than that of the S, weld. The welding direction of S2 is opposite to that of S,.
4.3 After the test piece cools down, use the naked eye or other appropriate methods to check whether there are cracks on the test weld S2, and measure the length of the cracks. 5 Calculation method
Calculate the crack rate according to the following formula:
Where: C—crack rate, %,
6 Record
The sum of the crack lengths, mm.
6.1 Test date, time, ambient temperature and humidity. ML
× 100%
6.2 Specimen steel grade and chemical composition, specimen state, and rolling direction. 6.3 Specimen temperature before welding, welding power type, welding polarity, electrode brand, electrode drying temperature and time, welding current, welding voltage and welding speed.
6.4 Specimen start detection time and method.
6.5 Test results: crack length and crack rate. 94
A.1 Scope of application
GB4675884
Appendix A
Explanation of "T-joint welding crack test method" (supplement)
This standard, like other crack test methods, takes the crack test of low-carbon steel electrodes as the object. Furthermore, in the West German national standard DIN, the method that is exactly the same as the T-type test method is also applicable to alloy steel electrodes. In the West German national standard, this standard uses T-type specimens of different materials and different sizes to formulate a high-temperature crack test method for austenitic electrodes. A.2 Preparation of test pieces
In order to make the bottom plate and the vertical plate close together, when using gas-cut vertical plates, the side connected to the bottom plate is required to be machined. A.3 Test steps
After the test weld cools down, in addition to checking for cracks with the naked eye, it can also be observed with a magnifying glass (about 6 times magnification), and magnetic particle inspection or penetrant inspection can also be used to check for cracks.
GB 4675.8—84
Test conditions
(reference)
B.1 The welding current should be appropriate. The average calculated thickness of the test weld S, is about 20% less than that of the first restrained weld S,. B.2 The welding interval between weld S, and weld S, should be less than 20s. Note: This appendix refers to the West German national standard DIN50129. Additional notes:
This standard is equivalent to the 1981 edition of the Japanese standard JISZ3153-1971 "T-joint welding crack test method". This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard was drafted by Harbin Welding Research Institute. The main drafters of this standard are Yu Jilun, Guo Shoufen and Cui Fengchi. 96
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