脉冲燃烧型焊条立焊纵向焊缝的组织  

Microstructure of longitudinal weld by vertical welding using pulse combustion welding rod for low-carbon steel

作　　者：吴永胜[1] 王建江[1] 辛文彤[1] 刘浩东[1] 曲立峰[1] 

机构地区：[1]军械工程学院先进材料研究所,河北石家庄050003

出　　处：《材料热处理学报》2013年第1期122-126,共5页Transactions of Materials and Heat Treatment

摘　　要：用脉冲燃烧型焊条对Q235钢进行了手工自蔓延立焊焊接,研究了立焊所形成的温度场与获得的焊缝合金组织。结果表明:脉冲燃烧型焊条中三段长度不同的高热焊药形成了三个有效熔池,两个低热造渣段只维持焊条燃烧和造渣而不形成熔池,在二者共同作用下每个熔池的温度场都不相同;焊缝合金相组成基本相同,但由于熔池温度场变化,造成从第一熔池到第三熔池晶粒逐渐减小,形成焊缝组织梯度变化,且第三熔池晶粒取向比第一和第二熔池明显;凝固后各熔池间存在明显的界面,在近母材端为冶金结合,而在近熔敷金属表面端结合较差,有轻微夹渣。Q235 steel was welded by manual SHS vertical welding with pulse combustion welding rod. Temperature field and weld microstructure in vertical welding were studied. The results show that three molten pools are formed under the action of three segments of high heat solder with different lengths in pulse combustion welding rod, while two segments of low heat slag agent only maintain combustion and slagging without formation of molten pools. The temperature field in each molten pool is different. The same phases in the weld are obseived. Changes of temperature field in molten pools result in grain refining from the first pool to the third pool, and the formation of microstrueture gradient and more obvious grain orientation of the third pool than that of the first and second pool. Clear interface exists between the solidified pools with metallurgical bonding near the base metal side but poor bonding near the side of the deposited metal surface for slightly slag.

关 键 词：脉冲燃烧型焊条 立焊 温度场 焊缝形貌 组织 

分 类 号：TG456.9[金属学及工艺—焊接]