摘要
保证坡口侧壁尤其是侧壁根部的熔化是实现窄间隙焊接的关键。用焊剂带对电弧加以约束可有效控制电弧的加热区域,有利于解决窄间隙焊接侧壁熔合不良的问题。采用间隙宽度为5mm的I型坡口,氩气保护的熔化极电弧,将特定成分的焊剂带沿坡口侧壁连续送入电弧区,焊剂带在电弧热作用下不断熔化并对电弧进行约束,从而可实现超窄间隙焊接。在不同的焊接电压下,通过改变焊剂带的送进速度进行超窄间隙焊接,得到了焊剂带对电弧的不同约束效果,以及与之对应的焊缝形貌,找到了可约束电弧且侧壁熔合良好的电压与送带速度范围。
To ensure the melting of groove sidewall, especially the root thereof, is the key to realizing narrow gap welding. The arc heating area can be controlled effectively by using arc constricted by flux strips, which helps to solve the problem of poor fusion of sidewall in narrow gap welding. With 5 mm ＂I＂ groove and metal arc protected by Ar, flux strips of special composition are successively sent into the arc zone along the groove sidewall, flux strips are melted successively by the arc heat while restricting the arc, thus being able to realize ultra-narrow gap welding At different welding voltages, different restriction effects of flux strips on arc and corresponding weld morphologies are obtained by varying the feed velocity of flux strips in carrying out ultra-narrow gap welding.The range of voltage and feed velocity of flux strips that can restrict the arc and ensure good fusion of sidewall are found out.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2009年第2期219-223,共5页
Journal of Mechanical Engineering
基金
国家自然科学基金(50775105)
兰州理工大学博士基金(SB01200702)
中国机械工程学会焊接学会创新思路预研经费(07-12-005)资助项目
关键词
焊剂带约束电弧
超窄间隙焊接
侧壁熔合
Constricted arc by flux strips Ultra-narrow gap welding Fusion of sidewall
