摘要
本文是在冷却器HSn62—1黄铜与1Cr18Ni9Ti奥氏体不锈钢熔—钎焊(Welding—braze)工艺试验的基础上,采用铜合金焊丝对奥氏体不锈钢的焊接中产生铜渗透裂纹进行了机理的研究。通过熔一钎焊的TIG工艺大量试验数据表明,液态铜对奥氏体不锈钢润湿、渗透,在焊接应力作用下,沿晶界渗透扩展而开裂,并且在裂纹中充满了液态铜。由于液态铜使晶界表面能明显降低,同时对裂纹尖端壁面产生一种附加压力,促使液态铜沿晶界加速扩展,形成奥氏体不锈钢液态金属脆化而导致铜的渗透裂纹。 本试验采用七种钢合金焊丝进行熔一钎焊的TIG最佳工艺试验,提出了适用的焊丝,指明了产生铜渗透裂纹的基本规律,为完善异种金属焊接提供了理论依据。
Based on the technical.experiments of welding-braze of the austenitic stainless steel lCrl8Ni9Ti and cooler brass HSn62-1, the article studied the mechanism of the copper contamination cracking yielded in welding of the austenitic stainless steel with brass wire.The results of TIG of welding-braze technique show that the liquid copper would wet and permeate austenitic stainless steel. By effecting of welding stress, it could result in cracking along the grain boundary, and the liquid copper would fill the cracks. Because liquid copper could lower the surface energy of grain boundary and yield an additional pressure on the surface of the ends of the cracks, the permeating of liquid copper along the grain boundary is sped up and the embrittlernent of austenitic stainless steel occurs,which results in the copper contamination cracking.Seven kinds of copper alloy wire were used to carry out the TIG of welding-braze.The suitable wire is found.The basic rule of copper contamination cracking is given, which set up the theoretical foundamental of welding of different kind of metal materials.
出处
《沈阳工业大学学报》
EI
CAS
1989年第3期85-95,共11页
Journal of Shenyang University of Technology
关键词
金属
材料
焊接
渗透
裂纹
dissimilar metal welding
inert-gas shielded tungsten arc welding
copper
osmosis
cracks
