摘要
焊条长期存放会引起药皮变潮,导致工艺性变坏,冷裂倾向增大,机械性能降低。经对存放4年的焊条进行了大量的复验工作,4种焊条的外观和工艺性抽检结果,其扩散氢含量符合国际规定;扦销试验和铁研试验结果表明焊条的临界预热温度符合规定;-40℃冲击功平均值大于73J,180个试件单值均大于5.1 J;焊缝金属的化学成分和机械性能均合格;研究了焊条烘干与冷裂的关系,指出焊条烘干是关键。
Welding rod stored for long time can cause its water content in coating to be increased, manufacturability to be bad, cold cracking tendency to be large and mechanical performance to be decreased. A lot of quality check for welding rods stroed for 4 years have been done. The result shows that apperance of four types of those ones is good, their sampling check for manufacturability is qualified, diffusible hydregen content is qualified to government specifications, the critical preheat temperature meets.the request of specifications after split type crack test and implant test, mean value of impulsing work at -40 degree centigrade is greater than 73 J, single value of 180 specimens is all larger than 5.1 J and chemical comtents and mechanical performents of welding seam are qualified as well.It works out that oven drying is key point after studying the relation between oven drying of welding rod and cold crack of welding seam.
出处
《石油工程建设》
北大核心
1990年第3期1-6,共6页
Petroleum Engineering Construction
