The longitudinal cracks along bond line and the transverse cracks which cut across the weld metal cross section inside weld metal were formed, while X65 pipe line steel was welding.

• X65管线钢在焊接过程中,内侧焊缝金属出现横向和纵向沿熔合线方向的裂纹,横向裂纹贯穿焊缝金属横截面。