Powder Coating with ER70S6 wire

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I heard that someone had problems powdercoating a weldment when this wire was used.  I'm not sure if they sandblasted the weldment or not, but thought I'd raise the question if the silicon and manganese content has something to do with it
Reply:Maybe the issue was with galvinizing? I've never heard of a prob with powder coat on s-6 or s-3.
Reply:Perhaps the problem was the joint.  Sometimes it is difficult to get the powder coating to adhere to corners and acute angles.  ...something to do with eddy currents.
Reply:Originally Posted by TEKMaybe the issue was with galvinizing? I've never heard of a prob with powder coat on s-6 or s-3.
Reply:Originally Posted by tapwelderPerhaps the problem was the joint.  Sometimes it is difficult to get the powder coating to adhere to corners and acute angles.  ...something to do with eddy currents.
Reply:YFZ- less silicone in s3 so galvy sticks better. Not applicable in your case. I  agree with tapweldor on the corner or angle issues tho- A good pc guy can do it  ok, he just has to try. In your case, I'd have to say slag not cleaned off and then p.c.'d over.  Bad form. Spankin's are in order
Reply:You need to radius your corners.  Paint doesn't stick well to sharp edges either, not enough surface area for the bond to occur.
Reply:There could be a couple things going on here.  S-6 doesn't really leave much slag, but it has a high silicon content and can leave what folks call "silica islands" which can usually be removed with a wire brush.Lincoln has pretty good details about the chemistry of filler metals.  S-3 is   considered the "standard" filler metal for mild steel.  S-6 is the same thing with more de-oxidizers (silicon and manganese) and can handle greater surface contaminants.  Even though S-3 is considerd the standard, most folks that I know run S-6.Did the powder-coating come off pre or post cure?-Heath