Random Porosity

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Hey guys...Well, tonight I was welding up some 3/16 steel, and all was going well. I was using my Hobart 187 set to 6/50 as the guide in the door reccommends, with 25 cfh of c25, and then BAM random porosity. What causes this?? It looks like a lack of shielding gas to me, but it should have been getting plenty. I'm using the stock regulator, and a 3/4 full bottle, if that makes a difference... Any ideas guys?? Thanks in advance...[Account Abandoned 8/8/16 Please Do Not Attempt Contact Or Expect A Reply]. See you on YouTube! -ChuckE2009
Reply:if there is any paint or contamination on the base material it will cause the porositySteve Hot Rod HooliganMiller Maxstar 200 STRCampbell Housfeld Flux Core 80
Reply:Generally those volcanoes are caused by "gassing out" of an abundance of impurities like paint and oil can do. It could even be coming from inside the tubing. Generally lack of shielding is just plain crappy all around."The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life." -Theodore Roosevelt
Reply:Hello Lanse, I believe the other folks have already mentioned the key things here, existing contamination. This can be from any number of things: oil on the parts from shearing, sawing, or other processing of the materials, marking paints that are commonly found on the edges of materials as they come from the steel supplier (common practice to paint the edges of plate with a certain color to indicate thickness, if you weld over them without removal they will cause porosity), excessive use of nozzle dip/gel/spray(sometimes these will give you porosity if you go overboard with their application). Additionally, you might be somehow kinking your gas supply hose without noticing it (this can occur in any number of ways as a result of possibly pulling on the feeder/welder while welding without noticing it). On rarer occassions, I have come across damaged whip assemblies where something has been dropped on them causing a hole and in some cases this hole would allow the gas to escape when the whip was positioned in a particular spot, thus it was intermittent and not always causing porosity. These are a few of my suggestions that you could possibly consider along with the others that have previously been mentioned. Good luck and best regards, Allanaevald