Study on Weld Cracking in Submerged-Arc Welding of High Tensile Strength Steel (Report 1)

Transverse Cracking

Abstract

It has been well known that there often occur some kinds of hydrogen-induced cracking, such as transverse cracking and root cracking, in the submerged-arc welding of HT-80 steels. There have been many studies on them individually, but would be very few on all-round quantitative conditions to prevent them.
Therefore, as the first stage, the prevention of the transverse cracking has been dealt with here.
The conclusions obtained are as follows;
1) Experimental equations are proposed for preventing the transverse cracking as functions of Ceq of electrode wire or P_OM of weld metal, and diffusible hydrogen content and critical cooling time of weldment.
2) The residual stress may be ignored in the conditions for the prevention of the transverse cracking.
3) A new method for the transverse cracking test has been developed to conduct the experiment more easily.