Main causes of subsurface bubble formation in S690QL young modulus

S690QL young modulus 2020 October inventory: 16*2200*12000, 10*2400*8450, 27*3510*7900, 14*2070*9060, 38*3300*13400, 30*2020*7000, 10*2400*8300, 35*2230*6000, 10*2200*8000, 8*2210*11000, 30*1600*10720, 25*2100*8400, 23.5*2950*10500, 38*3300*13400, 30*1600*10720, 8*2200*11200, 24*2500*5800, 25*2400*11600, 35*2220*10000, 21.5*1630*13480, 20*1950*9150, 80*2250*8850, 30*1600*10720, 21.5*1630*13480.

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Through chemical composition analysis and simulation tests, it is found that A514 Gr Q steel plate is prone to cracks or decreased toughness during welding. ASTM A514 Gr Q steel plate is sensitive to cold cracking. In order to obtain good weld quality of S690QL young modulus, A514 Gr Q steel plate, it should be controlled from two aspects: (1) control the hardness value of HAZ; (2) control the residual diffusible hydrogen content.

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