Capacitive Discharge Welding (CDW) is a similar process to RSW except large amount of energy is released in relatively a short amount of time. A research group at The Ohio State University working under supervision of Dr. Menachem Kimchi and Jerry Gould from EWI has investigated the feasibility of Al/Steel joining via this process.
Recently, technology employing capacitor discharge (CD) welding in conjunction with polarity switching has been developed. This work is a first effort in examining the response of resistance spot welding on aluminum sheet to polarity-switching CD power.
6) Welding of aluminum sheet with adhesives was readily accomplished using CD-based resistance spot welding: Resistance spot welding of aluminum sheet with an adhesive present at the faying surface was readily accomplished. Stable welding performance (and current ranges) were seen with and without a prepulse in the welding schedule.
A major challenge for high-volume resistance spot welding of aluminum sheet is durability of the electrodes themselves. In production today, electrodes have total anticipated lives (including dressing) on the order of 1000 welds. This is largely related to the use of medium-frequency direct current (MFDC) power.
Even with the standard fast CD weld times, aluminum needs to be as fast as possible. There are two primary techniques for CD welding Gap and Contact. When using the contact method, to increase the speed the user needs to add spring pressure to the tool. For the gap CD process, the user needs to add more lift or an initial gap to increase the speed.
As seen in this table, measured welding currents ranged from 11 to 25.5 kA. As suggested above, prepulse currents were maintained at about 20% of that seen for the main welding pulse. The key response measures were set-down or total indentation of the electrodes as well as the diameter of the resulting button.
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The paper deals with capacitor discharge welding of aluminum studs type AlMg3 on two different materials (alu-minum sheet of the same chemical composition with a thickness of 1.5 mm, and …
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The paper deals with capacitor discharge welding of aluminum studs type AlMg3 on two different materials (aluminum sheet of the same chemical composition with a thickness of 1.5 mm, and the...
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This work is a first effort in examining the response of resistance spot welding on aluminum sheet to polarity-switching CD power.
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Capacitive Discharge Welding (CDW) is a similar process to RSW except large amount of energy is released in relatively a short amount of time. A research group at The Ohio State University working under supervision of Dr. …
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