Characterising thermoacoustic emission in alternating current spot welding process

【摘要】 The acoustic emission of spot welding with thermoacoustic theory was studied in this paper,which provides new basis to analyze the quality of nugget with acoustic signal.The result shows that the thermoacoustic emission exists in both5052 Al alloy and cold-rolled steel AC spot welding process and this process takes place later than the load of welding current,and the frequency of thermoacoustic is twice as that of the welding current.The amplitudes of thermoacoustic signals detected from different angles are different,which undergo an up-down-up process.The thermoacoustic emission shows different trends with the thickness increase in AC resistance spot welding experiment for 5052 Al alloy and cold-rolled steel.更多还原

【Abstract】 The acoustic emission of spot welding with thermoacoustic theory was studied in this paper,which provides new basis to analyze the quality of nugget with acoustic signal.The result shows that the thermoacoustic emission exists in both5052 Al alloy and cold-rolled steel AC spot welding process and this process takes place later than the load of welding current,and the frequency of thermoacoustic is twice as that of the welding current.The amplitudes of thermoacoustic signals detected from different angles are different,which undergo an up-down-up process.The thermoacoustic emission shows different trends with the thickness increase in AC resistance spot welding experiment for 5052 Al alloy and cold-rolled steel.更多还原