Patent ID: 9050676
Filing Date: 2015-06-09
Classification: B23K

Abstract:
1. A method of welding, comprising: advancing an electrode towards at least one work piece to be welded, where said advancement is pulsed between a first advancement rate and a second advancement rate, where said first advancement rate is higher than said second advancement rate; providing a sensing voltage to said electrode at an initial voltage; detecting a contact between said electrode and said at least one work piece; detecting a separation of said electrode from said at least one work piece by detecting a rebound voltage, which is less than the initial voltage; stopping said pulsing of said electrode after detecting said separation; after said stopping of said pulsing, advancing said electrode toward said at least one work piece at a first fixed speed; and after said detection of said separation, providing a welding current to said electrode to weld said at least one work piece, wherein said electrode is advanced at said first fixed speed for a first duration and after said first duration said electrode is advanced at a second fixed speed which is different than said first fixed speed; and wherein after said detection of said separation an intermediate current is provided to said electrode before said welding current is provided to said electrode, where said intermediate current is less than said welding current.