A double pulse welding current method is disclosed for the generation and transfer of droplets of welding metal from an electrode wire to a workpiece in an arc welding process. A suitable background direct current level is specified to deliver a desired number of droplets to the weld site. During each cycle of droplet formation and transfer, a first increased current pulse is applied to the electrode and arc to generate a droplet on the tip of and electrode and then a second further increased current pulse is applied to timely separate the droplet from the electrode for transport in the arc to the workpiece. This double-pulse current application reliably produces one droplet per cycle of pulses to deliver a specified number of droplets to the weld site for improved weld quality and reduced spatter or waste of weld metal.
H. Tsai and P. Wang, "Metal Transfer in Arc Welding," U.S. Patents, Jan 2004.
Mechanical and Aerospace Engineering
Patent Application Number
© 2004 Motors Liquidation Co., All rights reserved.
01 Jan 2004