焊管Issue(2)：5-8,4.
焊接电流对高强铝合金电阻点焊热裂纹的影响
The Effect of Welding Current on Hot Cracking During Resistance Spot Welding for High Strength Aluminum Alloy
摘要
Abstract
In order to explore the effect rules of welding current on hot cracking during resistance spot welding, 2A12-T4 high strength aluminum alloy was resistance spot welded in DZ-3×63 three phase secondary rectifying spot welding machine with different welding current. Results showed that along with the increase of welding current, the solidification cracking appeared from scratch and proliferated constantly. When the welding current was 54% of equipment maximum current, the solidification cracking ran through the whole nugget. Liquidation cracking and beard cracking were also discovered in the heat affected zone, they both appeared when low melting point phase of grain boundary fusioned and tore by stress.关键词
焊接/电阻点焊/高强铝合金/焊接电流/结晶裂纹/液化裂纹/胡须裂纹Key words
welding/resistance spot welding/high strength aluminum alloy/welding current/solidification cracking/liquidation cracking/beard cracking分类
矿业与冶金引用本文复制引用
张涛,张勇,刘宗芳,谢红霞,张乾宁,石亚宏..焊接电流对高强铝合金电阻点焊热裂纹的影响[J].焊管,2014,(2):5-8,4.基金项目
国家自然科学基金资助项目（51275418）。 （）
