前者试验获得了一定激光功率和离焦量条件下两组焊接速度和送丝速度的匹配关系，并发现填充焊丝的加入对焊缝咬边现象确有改善；
Two groups of matching relation of the weld speed and the wire feed rate were found in a condition of invariable laser power and focus position.
在GMAW焊接过程中，当焊接速度达到某一临界值时会出现咬边缺陷，进一步提高焊接速度就会产生驼峰焊道。
In GMAW welding process, when the welding speed reaches a certain threshold, there will be onset of weld bead undercut defects.
横向焊接时由于熔化金属重力的作用，会引起熔池金属下淌，从而产生咬边以及焊瘤等焊接缺陷。
In horizontal position welding, the gravity makes molten metal flow downward and sometimes causes weld defects such as undercut and overlap.
从数值模拟入手，采用大型有限元软件A NSYS研究了不同尺寸、不同位置的咬边缺陷对压力管道焊接接头应力集中系数的影响。
This paper researches the effects of undercut defect on stress concentration in welding joint of pressure pipe by means of the finite element method software ANSYS.
焊接熔池平静，飞溅小，不咬边，焊缝成形美观。
Quite molten pool, little spatter and no undercut ensure workpiece be in good welding appearance.
结果表明，激光能够提高复合焊接的临界咬边速度，最高可达电弧焊接的5倍。
The results demonstrated that laser can increase undercut critical speed of hybrid welding, which reaches 5 times than that of arc welding with appropriate welding parameters.
结果表明，激光能够提高复合焊接的临界咬边速度，最高可达电弧焊接的5倍。
The results demonstrated that laser can increase undercut critical speed of hybrid welding, which reaches 5 times than that of arc welding with appropriate welding parameters.
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