EFFECT OF WELDING PARAMETER ON THE MECHANICAL PROPERTIES AND POROSITY RATE OF AA7003 ALUMINUM WELDMENT

• Main Authors: Chwei Fong Liu, 劉垂芳
• Other Authors: Chang Pin Chou
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/06369673431320941131

碩士 === 國立交通大學 === 精密與自動化工程學程碩士班 === 91 === The purpose of this investigation was to determine the optimum welding conditions and filler metal。The optimal post welding treatment for the dissimilar base metal was also evaluated。The 7003 aluminum alloy was used in this research. The Gas Tunsten Arc Welding process was used with filler metals of ER4043 and ER5356.The wire diameter was 。 Tensile test，microhardness test，optical metallographic examination，and SEM were conducted 。 The experimental results showed that hot cracking can be reduced in 7003 aluminum alloy welds made with suitable preheat。 The proper post weld heat treatment can effectively increase the strength in fusion zone and HAZ。 Precipitation in grain boundary and grain interior can cause hot cracking in 7003 aluminum alloy weld。The porosity content of the pulsed weld is in general found to be comparatively lower than that of the continuous regular weld。The increase in zinc pickup in fusion zone can enhances the ultimate tensile strength of the weldment。