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.
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