HR-2钢薄壁件激光热导焊研究

探讨了HR-2抗氢不锈钢制薄壁件的激光热导焊方法,研究了激光热导焊接HR-2抗氢不锈钢制薄壁件的工艺参数,分析了焊缝焊深的波动情况及影响焊深波动的因素,提出了有效的焊深波动控制措施.结果表明,采用降低焊接速度和焊前预热等措施,可以突破CO2激光热导焊接HR-2抗氢不锈钢的熔深极限,并且可降低焊深波动;在规范参数和工艺方法选择合适的情况下,激光焊接HR-2抗氢不锈钢薄壁件,可达到焊深≥0.25mm、焊深波动控制在±10%的范围以内、焊缝内部质量及表面成形质量优良的焊接要求;但焊缝质量受激光对中点和点焊点的影响很大,应尽量避免采用激光对中及点焊.

Laser conducting-limited welding of thin-wall HR-2 steel parts

Laser conducting-limited welding of thin-wall HR-2 hydrogen-resistant stainless steel (HRSS) parts is discussed,processing parameters is studied,fluctuation of penetration and its influencing factors are analyzed,and measures to control fluctuation of penetration are presented.It is found that the maximal depth of fusion can be exceeded,and the fluctuation of penetration can be lessened,by taking measures such as low welding speed and preheating,when the HR-2 HRSS is welded by CO₂ laser beam conduction-limited welding.With appropriate processing parameters and measures during laser conducting-limited welding of thin-wall HR-2 HRSS parts,depth of fusion can exceed 0.25mm,its fluctuation can be controlled in scope of ±10%,and good quality of weld can be achieved.Besides,centering and tack welding by laser beam should be avoided as centering point and tack-welding point can influence weld quality largely.