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Mig welding tack (Read 2847 times)

Kirkski Flatfender Master 2016 Sponsor Member 2015 Sponsor Member Offline Still Plays With Jeeps Posts: 525 Location: North Kingstown Joined: 11/11/13 Gender:	Mig welding tack 08/09/16 at 10:58:26	Print Post
	Does anyone have any insight to why my tack welds seem to have a hole in them? It's annoying

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Bob W Flatfender Master Owner Member 2012 2016 Sponsor Member Offline Posts: 2159 Location: Monticello, NY Joined: 10/19/10 Gender:	Re: Mig welding tack Reply #1 - 08/10/16 at 01:36:50	Print Post
	Contamination. Not enough shielding gas, dirty metal?

	Bob W
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1955CJ-5 Flatfender Master 2013 Sponsor Member 2016 Sponsor Member 2015 Sponsor Member Offline It wasn't always green.... Posts: 2338 Location: Boise, idaho Joined: 12/18/12 Gender:	Re: Mig welding tack Reply #2 - 08/10/16 at 02:27:49	Print Post
	I agree with Bob.... Clean the area thoroughly..I even used denatured alcohol to remove grease/oil etc... Are you purging the gas supply line before starting to weld? If you are filling holes or if the tack holes go through both pieces of metal you need to "back" the opening with copper( a flattened piece of copper pipe works great) or aluminum. This prevents air/oxygen from reaching the weld from behind.

	1955 CJ-5, A friend for 55 years....1951 CJ-3A, a new addition. 1929 Model A Ford Closed Cab Pickup...
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Roger Project Jeep Offline Camaro guy trying to figure out Jeeps Posts: 39 Location: Albany OR Joined: 07/14/16 Gender:	Re: Mig welding tack Reply #3 - 08/10/16 at 04:10:19	Print Post
	That looks like some of my welds when I forget to turn on my gas bottle. But as mentioned before... contaminants from the backside may be causing grief.

	1953 CJ3A (Navy) 1953 356 Porsche 1957 Chevy PU 1969 Chevy RS Camaro 1977 2WD Blazer
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Kirkski Flatfender Master 2016 Sponsor Member 2015 Sponsor Member Offline Still Plays With Jeeps Posts: 525 Location: North Kingstown Joined: 11/11/13 Gender:	Re: Mig welding tack Reply #4 - 08/10/16 at 13:43:27	Print Post
	Bob W, Rodger Thank you for the advice, I thought I only needed "backing" when I had a larger gap... I will try this out Friday, thank you so much! Kirk

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JeepFever 3A Guru Offline '2A trail/work - '3A project Posts: 250 Location: Virginia Joined: 10/17/14	Re: Mig welding tack Reply #5 - 10/03/16 at 03:10:29	Print Post
	I am far from expert, but as others have mentioned, my first thought was lack of shielding gas. edit: just realized this thread is kinda old. . . did you figure it out?
	« Last Edit: 10/03/16 at 03:12:25 by JeepFever »

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Kirkski Flatfender Master 2016 Sponsor Member 2015 Sponsor Member Offline Still Plays With Jeeps Posts: 525 Location: North Kingstown Joined: 11/11/13 Gender:	Re: Mig welding tack Reply #6 - 10/03/16 at 10:51:43	Print Post
	I posted this on my build page, but should be here as well, since I did start this thread about it... When I started this project I had no welding experience with MIG. I thought all of the issue I was having was me and my technique. Turns out after burning through a 2 lb roll of wire that my boss got me from "Advanced Auto Parts" my welds looked no better, had little penetration and I had to grind my backside off to make them look decent.. Well, I went to a local welding supply house and I picked up a new roll of the same spec wire size, grade etc... and what a difference it made.. Beautiful welds, nice penetration and easy clean up... Boy did I learn a valuable lesson... Don't buy crappy wire...

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JeepFever 3A Guru Offline '2A trail/work - '3A project Posts: 250 Location: Virginia Joined: 10/17/14	Re: Mig welding tack Reply #7 - 10/03/16 at 14:37:58	Print Post
	I saw your post about the crappy wire in your build thread, and did not tie the two together. haha Speaking of wire, that got me thinking, I have some wire in my welder now that results in a weld that is tough to grind. I have another roll on the shelf that I think is softer. (the wire itself is easier to bend). I probably should have tried this a long time ago. haha . . but, I still have quite-a-bit of welding to do. I can save the hi-tensile wire for structural projects. Only reason I have hesitated so far, the soft roll is .030, and the existing is .025. . . does anyone weld sheetmetal with .030?


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Kirkski Flatfender Master 2016 Sponsor Member 2015 Sponsor Member Offline Still Plays With Jeeps Posts: 525 Location: North Kingstown Joined: 11/11/13 Gender:	Re: Mig welding tack Reply #8 - 10/03/16 at 14:41:34	Print Post
	JeepFever All my welding was .030 wire

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