科研之友
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摘要
The viability of using the double-sided arc welding (DSAW) process, comprised of a plasma arc welding torch above and gas tungsten arc welding torch below the joint, to produc,. autogenous square welds between 1.0- and 1.5-mm-thick AA5182-O aluminum sheets for applications such as tailor welded blanks (TWB) has been studied. Visually acceptable complete-joint-penetration, conduction-mode DSA welds were produced with good cathodic cleaning of the oxide from both sides of the sheets over a wide range of welding speeds and powers from 10 mm/s when using 1.8 kW to 70 mm/s when using 4.6 kW Transverse tensile tests showed that the weld strength was similar to the thinner base metal sheet; however, the; displacement to failure was always less, than the base metal. Hydrogen porosity was observed in the welds; however, this was significantly reduced by stainless steel wire brushing all affected surfaces prior to welding. SEM-EDS analysis and microhardness tests showed that there was no significant variation in composition and hardness between the base metal and weld metal. The DSAW process was found to be capable of producing welds with excellent visual quality at welding speeds that exceed those of traditional arc welding processes, thus demonstrating the potential for attaining the high productivity rates required for aluminum TWB applications.
- 出版日期2010-1
