激光焊接速度对核级不锈钢腐蚀性能的影响

Influence of laser welding speed on corrosion property of nuclear grade stainless steel

文中对在不同激光焊接速度下得到的核级不锈钢焊接接头进行了核电模拟溶液常温腐蚀试验、点腐蚀和晶间腐蚀试验和高温高压水应力腐蚀试验.结果表明,随着焊接速度增大,焊接接头维钝电流上升,点蚀电位上升.在同一焊接接头中,热影响区的耐点蚀性能和晶间腐蚀性能最好,焊接接头整体其次,焊缝区最差.最低焊速下得到的焊接接头容易产生高温高压水SCC,其SCC裂纹一般从焊道根部的热影响区萌生和扩展.

The pitting,intergranular and general corrosion test in the nuclear power simulation water on laser welded joint at different welding speeds,as well as stress corrosion cracking( SCC) test in high temperature and high pressure water were carried out. The results indicated that with the increase of welding speed,the passive current and pitting corrosion potential increased. At the same weld joint,the heat affected zone exhibited the best pitting and intergranular corrosion resistance,followed by weld joint,and the weld zone showed the worst performance.SCC at the lowest welding speed easily took place,and the SCC crack generally initiated and propagated from weld root of the HAZ zone.