摘要
研究了焊接电流对6008-T66铝合金/H220YD钢焊接接头组织和力学性能的影响,探讨了影响异种金属焊接接头断裂行为的作用机理。结果表明,随着焊接电流从18 k A增加至22 k A,熔核直径和压痕率都呈现快速增加的趋势,而当焊接电流超过22 k A后,熔核直径基本不变或略有增加,而压痕率不断增大;铝/钢焊接接头中心界面金属间化合物层厚度随着焊接电流的增加而逐渐增大,在焊接电流为25 k A时厚度达到7.1μm;随着焊接电流的增加,铝合金/钢焊接接头的拉剪力呈现先增加而后降低的趋势,在焊接电流为22 k A时取得最大值;焊接电流为22 k A时拉剪试样以钮扣断裂方式在熔核处断裂,而焊接电流过高或者过低,拉剪试样都断裂在结合面处。
The effects of welding current on microstructure and mechanical properties of the welded joint of 6008-T66 aluminum alloy/H220YD steel were investigated, and mechanism of the fracture behavior of dissimilar metal welded joints was enpound. The results show that with the welding current increas- ing from 18 kA to 22 kA, the nugget diameter and indentation rate exhibit a rapidly increasing trend, however, with the welding current more than 22 kA, the nugget diameter remains stable or increased slightly, while the indentation ratio is increased gradually. The thickness of intermetallic layer in the in- terface of aluminum / steel welded joint is increased with the increase of welding current, and the thick- ness reaches 7.1μm when the welding current is 25 kA. With the increase of welding current, the ten- sile shearing force of 6008-T66 aluminum alloy /H220YD welded joint is increased firstly and then de- creased, and the maximum value can be obtained when the welding current is 22 kA. When the welding current is 22 kA, the tensile shear specimen is broken at the nugget with the button breaking mode, and the welding current is too high or too low, the tensile shear specimen is cracked at the interface.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2017年第6期659-662,共4页
Special Casting & Nonferrous Alloys
关键词
焊接电流
铝/钢异种金属
金属间化合物
拉剪力
Welding Current, Al / Steel Dissimilar Metal, Intermetallie Compound, Tensile Shearing Force
