Repair welding experiment by CMT welding technology for thick aluminum alloy plate

For the demand of low heat input, high quality welding technology, the repair welding experiment using CMT welding technology have been examined in thick aluminum alloy plate welding. The multiple repair welding was performed for hot cracking test in thick aluminum alloy plate. The results have shown that the hot crack susceptibility of CMT welding is lower than the pulsed MIG welding process. The test showed that CMT welding temperature field was lower, and the microstructure of welding joint was improved significantly compared to the joint welded bypulse MIG welding.