摘要
钛合金是一种具有高的比强度和较好的耐腐蚀性,低温下能保持良好的塑性和断裂韧性的合金。在焊接过程中尽管钛合金的残余应力低于屈服极限,但是其物理特性导致焊接过程中产生较大的变形,阻碍了焊接的进行。同时钛合金在焊接过程中表现出较强的化学活性,焊后在焊缝区存在着大量的气孔,表面由于氧化严重会呈现蓝色,焊件塑、韧性急剧下降,导致产品报废。文中在原有的焊接工装设计经验基础上,根据随焊控制焊接变形的工艺要求,设计出一种采用喷流保护的焊接工装,用于钛及钛合金焊接过程。通过试验验证了该焊接工装的实用性和操作时的便利性。
Titanium alloy possesses high specific strength and corrosion resistance.It can still keep perfect plasticity and fracture toughness at low temperature.Therefore,it gets a wide application in industry.Welding residual stress is a little lower than the yield limit of base material, but the physical characteristics of titanium alloy induce much deformation during the welding process.At the same time,titanium shows chemical active during welding.Large amounts of pores are formed in the weld zone,the color of the joint surface changed to blue as a result of severe oxidation.Plasticity and toughness of the weldment is drastically lowered,which makes the weldment out of service.According to the requirement of the technology,which can control the residual strain in welding,the welding fixture was designed to protect heated metal plate based on different types of fixture design experience.The welding fixture utilizes the protecting method of spraying pattern.Some tests were done to testify the practicability and facility of the welding fixture.
出处
《焊接》
北大核心
2009年第10期46-49,共4页
Welding & Joining
基金
中国博士后科学基金资助项目(20070410900)
关键词
喷流保护
焊接工装
TC4
TIG焊
spraying pattern protection
welding tooling
TC4
TIG welding
