摘要
采用激光-MAG复合焊接方法对25mm厚Q355C高强钢开展平板堆焊工艺试验，研究各主要参数（光丝间距、送丝速度、离焦量、激光功率和焊接速度）对焊缝成型的影响规律.结果表明，光丝间距为3mm时，焊缝成型最好；增加送丝速度使焊缝熔深熔宽都增加；负离焦量的增大更有助于增加熔深；激光功率对焊缝熔深起主导作用；焊接速度的增大使焊缝熔深减小。万瓦级激光-MAG复合焊接在特定的参数组合下，激光和电弧两种热源之间具有良好的耦合效应，可以获得较深熔深且无缺陷的焊缝，实现高效焊接。
关键词： 激光-MAG复合焊接；工艺参数；焊缝成型；截面形貌
Abstract
Laser MAG hybrid welding method was used to carry out plate surfacing process teston 25 mm thick Q355C high strength steel, and the influence of main parameters (wire spacing, wire feeding speed, defocusing amount, laser power and welding speed) on weld formation was studied. The results show that the weld formation is the best when the wire spacing is 3 mm; the weld penetration and width increase with the increase of wire feeding speed; the increase of negative defocus is more helpful to increase the weld penetration; the laser power plays a leading role in the weld penetration; the weld penetration decreases with the increase of welding speed. The results show that the coupling effect between laser and arc is good, and the weld with deep penetration and no defects can be obtained under the specific parameter combination of laser MAG hybrid welding.
Key words： Laser MAG hybrid welding; process parameters; weld formation; cross section morphology
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