It showed that the weld cross section with both laser welding processes transformed from nail shape to near X shape with increase of laser power and decrease of welding speed.
结果表明，随激光功率增大和焊接速度降低，复合焊与单一激光焊焊缝的横截面形貌均由钉形向近X形转变。
With increase of heat input and laser power density, the cross section of the weld transformed from nail shape to near X shape.
随焊接热输入和激光功率密度的增大，焊缝截面由钉形向近X形转变。
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。
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