Owing to the high levels of radioactivity , it had been impossible to bolt or weld the object shelter together , so within a decade it was on the verge of collapse .
Rods and wires shall have a smooth finish , free from surface imperfections , corrosion products , grease or other foreign matter which would affect the quality of the weld .
焊条与焊丝应该表面光洁,不得有缺陷,也不应有锈垢和油脂等杂质,因为它们会影响焊接的质量。
Studies involve examination of the parent material , the heat-affected zone , the weld metal , and the interfaces between all metals involved .
研究内容包括检查母材,热影响区,焊接金属,与所有金属之间的界面。
Smaller entrepreneurs hack into pipelines to siphon off oil , which is turned into fuel in bush refineries , while bigger operators weld taps onto pipelines with generators to help pump thousands of barrels of oil into barges .
Nondestructive evaluations will validate the strength and integrity of the weld before the spacecraft is prepped for ground testing in flight-like environments , including static vibration , acoustics and water landing tests .
In another building , workers weld solar cells together into strips , then align them by eye on a light box to form the rows and columns of cells that make up a complete solar panel .