摘要
用钨极氩弧焊(TIG)和变极性等离子弧焊(VPPA)对2195与2219异种铝合金进行平板对接焊,研究了不同焊接方法和在有无保护气氛条件下焊接接头的显微组织和性能。结果表明,在用TIG和VPPA工艺焊接的接头区域都没有出现宏观热裂纹,能量密度高、焊接快和热输入量小的VPPA工艺使焊缝区域较窄;异种铝合金焊缝接头熔合线附近的主要析出相为θ相,在焊缝区域有α-Al与θ相组成的共晶组织;在TIG工艺和有气氛保护的VPPA工艺的焊接接头区域没有出现局部软化现象,焊缝区域的硬度与2219侧母材相同。TIG工艺的焊接接头,其抗拉强度更高。
Butt welding joints of 2195 and 2219 Al-alloy plates were prepared by tungsten argon arc welding(TIG) and variable polarity plasma arc welding(VPPA) respectively while applying argon shielding and no argon shielding, and then the influence of processing parameters on the microstructure of the welding joints were assessed by means of metallographic microscope, scanning electron microscope(SEM), hardness tester and tensile testing machine. The results show that no macroscopic thermal cracks were detected in the welding seam of the joints prepared by TIG and VPPA welding processes,however the VPPA welding process results in narrower welding seam due to its high speed processing with low heat input whilst high energy density. The main precipitates near the fusion line of the weld joints are θ-phase, while eutectic microstructure of α-Al and θ-phase exists in the weld seam. No local softening existed in welded joints prepared by TIG and VPPA with argon shielding, correspondingly, the hardness of the weld seam is more or less the same as that of the base metal of 2219 Al-alloy side, and the welding joints prepared by TIG possess higher tensile strength.
作者
聂敬敬
龚政轩
孙京丽
杨斯达
夏先朝
徐爱杰
NIE Jingjing;GONG Zhengxuan;SUN Jingli;YANG Sida;XIA Xianchao;XU Aijie(Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2023年第2期152-160,共9页
Chinese Journal of Materials Research
