Second welds

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Well last weekend I tried a little welding with the new Hobart 187, posted the pictures, read the comments, and tried again. So here are some week 2 pictures. I think there is some improvement, but let's see what the pros have to say.Running the argon/co2 mix at about 20CFH. Heat set on 6 and wire feed on 45. This time I ground the rust off and tried to concentrate the arc on both pieces of metal. Let me know how i did.The second picturew is actually the first set of welds. There are some holes in the some of them and I am not sure what caused this. Attached Images
Reply:the little holes in your weld is porosity.metal not clean or not good gas coverage.try 25 cfm then 30 and see what happens.are you working out side in the winddo you have a pic of your gun, show the tip and nozzledo not clean it up for the pic.
Reply:Only one who doesn't have a clue what he's talking about would recommend flowing 25-30 CFH thru an H-10 gun.  That gun has a very small nozzle.If you're welding outside, you're probably better served with flux core.If it's breezy inside, you need to eliminate the drafts.  With the HH 187 and H-10 gun 12-15 CFH is plenty.Syncro 250 DX Dynasty 200 DXMM 251 w/30A SG XMT 304 w/714 Feeder & Optima PulserHH187Dialarc 250 AC/DCHypertherm PM 1250Smith, Harris, Victor O/ASmith and Thermco Gas MixersAccess to a full fab shop with CNC Plasma, Water Jet, etc.
Reply:Originally Posted by SundownIIIOnly one who doesn't have a clue what he's talking about would recommend flowing 25-30 CFH thru an H-10 gun.  That gun has a very small nozzle.If you're welding outside, you're probably better served with flux core.If it's breezy inside, you need to eliminate the drafts.  With the HH 187 and H-10 gun 12-15 CFH is plenty.
Reply:VERY nice man!! You're coming right along. I have a 187 and I love it, I hope that you like yours as well.on the welds, they look way better than the last set. GMAW porosity is generally caused by a lack of shielding gas, but if you didn't have any shielding, it would be WAYYYYY worse. Believe me.I think you have surface contamination of some kind, maybe a little oil or grease on there somewhere. mig isn't very forgiving with stuff like that. Id buy something with welds that looked like that. For me, thats the real test. Good luck, keep the pictures coming, and happy welding [Account Abandoned 8/8/16 Please Do Not Attempt Contact Or Expect A Reply]. See you on YouTube! -ChuckE2009
Reply:Do you purge your gun before starting to weld for the day? It's good practice to purge for a few seconds when first starting up for the day to make sure you have gas at the nozzle and to drive out any moisture in your gun, etc. Hard to see for sure, but it looks like you might still have some surface conamination (rust , etc.). The cleaner the better...
Reply:dude, most of those welds would pass visual inspection on my jobs. Be diligent. you will crack the nut in due time.Weldanpower 225 G7Ironworkers Local #24
Reply:Looks pretty decent. As long as your welds have full penetration and no porosity then they are probably just fine for most situations. I would continue to clean your metal with the grinder as you did for your second round and possibly wipe it down really good with some acetone if there is a possibility that it is contaminated
Reply:it is also cause by too high of a shielding gas flow bring in atmosphere into the weld puddle making porosityMiller Xmt 350Lincoln Ln-25Ahp 200xSmith Gas Mixer AR/HTig is my Kung FuThrowing down dimes and weaving aboutInstagram http://instagram.com/[email protected]
Reply:No one has mentioned that a possible cause of the porosity is too great a nozzle to work distance, or spatter trapped inside the nozzle disrupting flow?Give me fuel, give me fire, give me that which I desire.
Reply:I did not purge my line. The left weld on the bottom picture would have been the first one after I turned on the machine, Since it looks like the worst one, I probably did not have enough sheilding gas. Thinking back I may have been a little far away on the with the gun on the bottom set of welds.There sure is a lot to learn for something that seems so simple.Thanks for the comments. I think I am going to get to work on a welding table in the next couple of weeks.
Reply:Originally Posted by ed macso your saying not to try 25-30 cfm one time to see what happensflux core out side or eliminate the drafts wow that should be a stickyim shure no one here has ever herd of that, maybe youllget in a welding magazine with that infothe only draft here is your mouth
Reply:Originally Posted by tallgrass.There sure is a lot to learn for something that seems so simple..
Reply:Originally Posted by tallgrassI did not purge my line. The left weld on the bottom picture would have been the first one after I turned on the machine, Since it looks like the worst one, I probably did not have enough sheilding gas. Thinking back I may have been a little far away on the with the gun on the bottom set of welds.There sure is a lot to learn for something that seems so simple.Thanks for the comments. I think I am going to get to work on a welding table in the next couple of weeks.
Reply:Originally Posted by WeldingWookieit is also cause by too high of a shielding gas flow bring in atmosphere into the weld puddle making porosity