This standard applies to the welding crack test of welding rods such as GB 981-76 "Welding rods for low carbon steel and low alloy high strength steel" and GB 983-76 "Welding rods for stainless steel". GB/T 4675.4-1984 Weldability test for weld crack test method for press plate butt joint (FISCO) welding GB/T4675.4-1984 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Weldability testing
Fissure plate butt joint (FISCO) welding cracking
Test method
Weldabillty testing
Method of FIsco cracking testUDC 621.791.058
.86: 620.192
GB 4675.4—84
This standard applies to the welding cracking test of welding rods such as GB981—76 "Low carbon steel and low alloy high strength steel welding rods" and GB983-76 "Stainless steel welding rods".
1 Preparation of test piece
1.1 The shape and size of the test piece are shown in Figure 1. 200
Figure 1 Shape and size of the test piece
1.2 The groove shape of the test piece is I-type, which is machined by mechanical cutting. 1.3 During the test, in order to avoid the influence of oxide scale on the welded part, the surface near the butt groove of the specimen shall be polished or machined. 2 The test device consists of a C-shaped restraint frame, a toothed base and fastening bolts. See Figure 2. National Bureau of Standards 1984~07-28 Issued
1985-0$-01 Implementation
3 Test steps
GB 4875. 4--84
Figure 2 Schematic diagram of the test device
.1 Install the specimen in the test device shown in Figure 2, and install plugs of corresponding sizes at both ends of the specimen groove according to the test requirements to ensure the groove gap. The groove gap can vary in the range of 0 to 6 mm. 3.2 Tighten the horizontal bolts until they support the specimen. The vertical bolts should be tightened with a force wrench with a torque of 1200kgf·cm.
3.3 As shown in Figure 3, weld 4 test welds of about 40 mm in length in sequence, with a weld spacing of about 10 mm. In principle, the welding crater is not filled.
3.4 ​​Take the test piece out of the test device about 10 minutes after welding. 3.5 After the test piece cools down, bend the weld of the test piece axially, observe whether there are cracks on the cross section and measure the crack length. Test weld
Figure 3 Position of test weld
4 Calculation method
, according to Figure 4, the crack rate is calculated by the following formula for the crack length measured on the cross section of the four welds. 98
Where: C——crack rate, %,
GB 4675.4—-84wwW.bzxz.Net
Zli -m
——the sum of the crack lengths of the four test welds, L——the sum of the lengths of the four test welds. Mti
x100(%)
Figure 4 Calculation of crack length
5 Record
Test period, time, ambient temperature and humidity. 5.1
5.2 Steel grade and chemical composition of the test piece, test piece state, test piece thickness and rolling direction and plug thickness. 5.3 Test piece temperature before welding, type of welding power supply, welding polarity, electrode chemical composition or brand, electrode diameter, electrode drying temperature and time, welding current, welding voltage and welding speed. 5.4 Test piece inspection time and method.
5.5 Test results: crack length and crack rate. A.1
GB 4675.4—84
Appendix A
Explanation of “Fissure Plate Butt Welding (FISCO) Welding Crack Test Method” (Supplement)
Assembly drawing of test device for pressure plate butt welding (FISCO) welding crack test method (see the figure below). 420
Assembly drawing of C-shaped restraint frame
1 C-shaped restraint frame, 2 test piece, 3—fastening bolts; 4—toothed base, 5—shield, 6—adjustment plate 100
GB4675.4--84
Additional explanation:
This standard is equivalent to the Japanese 1981 edition JIS Z3155-1979 “Fissure Plate Butt 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.
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