Improved arc initiation

Details Improved arc initiation Improved arc initiation

B - Operations, Transporting

23

K

B23K 9/06 (2006.01) B23K 9/067 (2006.01) B23K 9/10 (2006.01) B23K 10/02 (2006.01)

Patent

CA 2348340

This invention provides a method and apparatus for improved arc initiation during Gas-Metal Arc welding. The unstable period at the arc start is a period when increased spatter is produced and increased fume is generated and defects such as unacceptable weld bead profiles, porosity and inadequate penetration occur. It has been observed that initiating the arc using a substantially higher average arc current and thereafter switching the power supply to a CV mode for the remainder of the Gas-Metal Arc welding operation decreases the arc initiation period and the instability produced during this arc start period. Initiating the arc using a CC supply and then dynamically switching on-line the power supply to CV operation provides a means of decreasing the arc initiation period and the amount of instability produced during the arc initiation period. Power supplies for Gas-Metal Arc welding and other applications requiring on-line switching between CC and CV are disclosed.

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