Fluxcore help

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I have been using a lincoln 155 Fluxcore to repair a trailer for a friend, all of my welds have been coming out great, until tonight, I started on the on the outside of the trailer and am getting what looks like air bubbles in the welds, I have tried cleaning more b4 I start, wire speed & heat...still getting the same welds...I have stopped for the night to look on like to see what could be causing this..I am welding 1/8 to 1/8 and using .35 wire...thanks  for any help -Paul Miller 211 & Spoolmate 100Miller Diversion 165Miller Spectrum 875
Reply:Try turning the wire speed up. When I get the Swiss cheese look or chicken tracking, I know my wire speed is on the slow side.
Reply:I tried faster and slower..any one think it could be road oils comming off the trailer from the heat?Miller 211 & Spoolmate 100Miller Diversion 165Miller Spectrum 875
Reply:Hello Corbinworks, have you had any sort of weather change? Are you still using the same roll of wire that you started with? Is there any possibility that the outside of the trailer has been undercoated or otherwise sprayed with any sort of anti-rust type preventative? Are you grinding/removing the paint/rust/other foreign materials, etc. from the area where you are doing the welding? I am asking all of these questions because self-shielded wires can be real finicky about welding through certain foreign objects/substances. They are also really bad about picking up moisture from high humidity, rain, snow, or other weather conditions that could allow moisture to settle on or be absorbed by the wire spool. Something as simple as having your welder inside where it is warm and then dragging it outside where it is colder and the humidity is relatively high could promote moisture to accumulate or condense on the wire and thus cause porosity issues. Has anyone else used your equipment and possibly changed the polarity? Do you have a new spool of wire that you could try on the machine? This might point to whether there is a contamination issue with the wire itself and help to rule out that part of the equation. Various wire manufacturers have different techniques for manufacturing their products. Some form the outer sheath of the wire around the flux that is inside leaving a butt type seam, others use a sort of lock-formed seam, still others use a seamless type of production process. The order that I have these listed is generally the order that describes the least desirable to the most desirable form of manufacturing to provide for a long-lasting quality wire where moisture pick-up/contamination is a concern. These are a few items for your consideration, likely others will have additional ones. Good luck and best regards, Allanaevald
Reply:arvald, I think you got it!!Something as simple as having your welder inside where it is warm and then dragging it outside where it is colder and the humidity is relatively high could promote moisture to accumulate or condense on the wireI keep the welder in doors & today it was over cast and looked like rain and a little colder then norm..I did install a new spool, cause I used up what I had in the welder, amazing how much that changed it..I hope this is all it is..I will put the trailer on hold till the weather clears up..only bad thing is its going to be like this for another day and then a cold front...blahMiller 211 & Spoolmate 100Miller Diversion 165Miller Spectrum 875
Reply:Hello again Corbinwelds, you don't necessarily need to put it on hold. You might be able to use a trouble light to "hang" inside of the wire compartment to keep it warm and dry. Just be careful how you go about doing that to keep from melting plastic parts of the machine or "shorting out" the welding circuit and causing other issues. Best regards, Allanaevald
Reply:Originally Posted by aevaldHello again Corbinwelds, you don't necessarily need to put it on hold. You might be able to use a trouble light to "hang" inside of the wire compartment to keep it warm and dry. Just be careful how you go about doing that to keep from melting plastic parts of the machine or "shorting out" the welding circuit and causing other issues. Best regards, Allan