激光-MAG复合焊能量配比对SMA490BW耐候钢焊缝的影响

Effect of energy ratio on welded joint in laser-MAG hybrid welding of SMA490BW weather-resistance steel

针对耐候钢的激光-MAG复合焊,研究不同能量配比系数对复合焊缝熔深、熔宽、微观组织的影响。研究结果表明:随着能量配比系数的增大,焊缝总熔深逐渐增加,熔宽逐渐减小,热影响区面积先减小后小幅增大。激光功率对熔深起主导作用,电弧区的热影响区宽度明显大于激光区的热影响区宽度。热影响区中过热区晶粒组织粗化较明显。与焊缝电弧区相比,焊缝激光区的微观组织晶粒更加细小。中厚板焊接中打底层应选用大的能量配比系数,填充盖面层应选用小的能量配比系数,对接焊结果表明优化后的参数能够获得无缺陷、成形良好的焊缝。

Effects of energy ratio on the weld width,weld penetration and microstructure are investigated for hybrid laser-MAG welding of weather-resistance steel. The results show that with the increase of the energy ratio coefficient weld penetration increases,weld width decreases,the area of heat affected zone area decreases initially but then increases. Laser power plays a dominant role in the melting depth. The width of the heat affected zone in arc zone is wider than that in laser zone. The grains of coarse grained heat affected zone are coarsened. The grain size of the laser zone is finer than of that in arc zone. For the medium thick plate welding,large energy ratio coefficient should be chosen in the root pass welding,and small energy ratio coefficient for filling pass welding. The welded joint with good appearance,defects-free can be obtained under the optimum parameters.