摘要
7A52 Al alloy plate aged at 105 ℃ for 8 h and then at 130 ℃ for 24 h was welded by means of TIG using Al- 6.3Mg-0.35Sc-0.1Zr-0.1Cr solder wire. Mechanical properties and microstructures of welded joint were studied. There are two obviously soft areas in the welded joint, welding seam and over-aging zone. The mechanical properties of welded joint are that σb is 358 MPa, σ0.2 is 238 MPa and δ5 is 6.6%. 75.6% of welding coefficient can be achieved. The addition of scandium leads to very significant grain refinement in the fusion zone, which results in a reduction in solidification cracking tendency. The solidification cracking isn’t observed.
7A52 A1 alloy plate aged at 105℃ for 8 h and then at 130℃ for 24 h was welded by means of TIG using A1- 6.3Mg-0.35Sc-0.1Zr-0.1Cr solder wire. Mechanical properties and microstructures of welded joint were studied. There are two obviously soft areas in the welded joint, welding seam and over-aging zone. The mechanical properties of welded joint are that σb is 358 MPa, σ0.2 is 238 MPa and δ5 is 6.6%. 75.6% of welding coefficient can be achieved. The addition of scandium leads to very significant grain refinement in the fusion zone, which results in a reduction in solidification cracking tendency. The solidification cracking isn＇t observed.
出处
《中国有色金属学会会刊：英文版》
CSCD
2008年第4期804-808,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(2005CB623705) supported by the National Basic Research Program of China
关键词
微合金
铝合金
焊接节点
微观结构
力学性能
microalloying
Al alloy
welded joint
microstructure
mechanical properties
