ToolSteel Posted June 30, 2012 Share Posted June 30, 2012 I'm very new to stick welding and I have a prep question. Before I lay a second bead,I know to chip away the black, glassy slag that forms over a weld. Bit what about the powdery film that coats the metal yet to be welded? I figure this is from the electrode coating. This film is extremely thin and I wonder if it's OK to weld right over it. Quote Link to comment Share on other sites More sharing options...
SoCal Dave Posted June 30, 2012 Share Posted June 30, 2012 It would help if you brushed it with a wire brush. This should help remove some of the dust. Quote Link to comment Share on other sites More sharing options...
Ramsberg Posted June 30, 2012 Share Posted June 30, 2012 Just knock it off with a wire brush. If there is something on the metal it isn't clean. Quote Link to comment Share on other sites More sharing options...
ToolSteel Posted July 1, 2012 Author Share Posted July 1, 2012 Makes perfect sense. Thanks. Quote Link to comment Share on other sites More sharing options...
Robert Yates Posted July 1, 2012 Share Posted July 1, 2012 A 4 1/2 grinder with a wire wheel will do the trick if you have doubts . Sam Quote Link to comment Share on other sites More sharing options...
Hillbillysmith Posted August 4, 2012 Share Posted August 4, 2012 I agree with Sam 110%..... You CAN sit n chip away at the slag, scrap and scrub with a wire brush OR just hit it with a wire wheel for 5 seconds. Either way, once you get experienced, the slag will peek off by itself. -Hillbilly Quote Link to comment Share on other sites More sharing options...
AndersMJ Posted August 4, 2012 Share Posted August 4, 2012 One shouldn't be chipping at the slag though, but rather raking it. Chipping away at it will most likely cause dents in the weld. Quote Link to comment Share on other sites More sharing options...
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