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在细管径侧吹气体的辅助下,对SUS 304不锈钢试样进行了光纤激光焊接,使用高速摄影设备配合背景激光光源对匙孔、熔池以及金属蒸气的行为进行了观察,并对焊缝熔深和焊缝成形进行了分析。结果表明:在激光功率、焊接速度、离焦量、喷嘴位置与角度等参数一定的情况下,焊缝熔深随着细管径侧吹气体流量的增大而增加。细管径侧吹气体可以明显打开匙孔并维持匙孔稳定性,并扩大熔池面积。气体流量大小对焊缝成形有较大影响。当无细管径侧吹气体时,飞溅较大,焊缝成形均匀;当气体流量较小时,飞溅较小,且焊缝成形均匀;当气流量过大时,飞溅较小,但焊缝成形较差。
With the help of small gas blowing on the side of the tube, the stainless steel SUS 304 sample was fiber laser welded, the use of high-speed photographic equipment with the background laser light source on the keyhole, molten pool and metal vapor behavior was observed, and the weld Melting depth and weld forming were analyzed. The results show that the weld penetration increases with the increase of the flow rate of gas on the side of thin tube under the condition of certain parameters such as laser power, welding speed, defocusing amount, nozzle position and angle. Small tube side blown gas can significantly open the keyhole and maintain keyhole stability, and to expand the pool area. Gas flow size of the weld forming a greater impact. When blowing gas without thin tube side, the spatter is larger and the welding seam is formed evenly. When the gas flow rate is smaller, the spatter is smaller and the welding seam is formed evenly. When the gas flow is too large, the spatter is small, but the welding seam is formed Poor.