#1
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Help with OA welding 20 gauge roof section
I'm patching sections of the roof on my truck with pieces from a like truck. I was able to tack the replacment section every 6 inches or so and planished to restore the pre-tack gap.
Now I having some issues when going between those tacks. It seems as soon as I bring the torch (Meco Midget + N1 tip) close to the panel, that one side goes up and the other goes down creating a large gap. My option will be to Mig as it will weld before that happens, but I would like to finish using the gas torch. Anyone have any recommendations for me? Thanks in advance, Ernie
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Ernie Franzen Queen Creek, AZ |
#2
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Tack again closer together and bring the tacks to ultimately 1.5 inches apart.
Want to be creative? See my album here on paneling the Model A roof .... ? http://allmetalshaping.com/album.php?albumid=865 I use "long tacks" when the metal is willing. Look like "skip welds" when interspersed with "real" tack welds.... ? (see photo) Then planish that whole effort of long tacks and short tacks that leave only the 1.0 - 1.5in spaces. Weld it, and hammer out as you go. Weld two inches and hammer, or weld three inches and hammer. Or weld a full length and hammer. Up to you. Sometimes I work in short stretches and sometimes when the lengths are long with long wave distortions, I hammer the whole works at one time. yeehaw
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#3
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Ernie, are you trying to tack again right in the middle of your 6" tack spacing? Ifso, try just going only 3/4" beyond each tack instead.
Edit: in addition to being a far better metalshaper than I, it also looks like Kent is a much faster typist as well.
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Mark from Illinois |
#4
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Truer words have not been spoken. There is no hard and fast rule, you can do only what the metal allows. Sometimes it allows use of such rules, other times, its not conducive towards such methods.
Honestly, I wouldn't have left any gap when welding of any process. I then look for my tightest points, tack there, then the next tightest, and so on until the panel is welded. I planish as I go only as needed to maintain the shape of the panel. Sometimes the resulting shrink from a weld is what I wanted, other times, I need to hammer on dolly a little to stretch the weld some to keep my datum line of the panel true. Each tack is different, each weld is different, each panel is different, no two act the same. There are similarities, sure, and after a while you begin to develop a method that works, most of the time. The more you do it, the more practice you have, and the more little tricks you use (without even realizing it) to get yourself through a panel. Marty
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Results = (Effort X Determination2) + Time |
#5
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Quote:
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John EK Holden V8 |
#6
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Thank you all for the information. I'll keep at it and let you know how it goes.
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Ernie Franzen Queen Creek, AZ |
#7
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Quote:
5_0073 copy.jpg Tack where you can. Hammer a bit to level the tack, if needed. Then tack more where the metal lets you, and hammer a bit if needed, until your tacks are 1.0-1.5in apart. 4_0056 copy.jpg Weld a stretch solid, say for 3 inches, or stop when the metal goes unwilling. 3_ 0058 copy.jpg Hammer that stretch out, to sort of level. Then weld the next stretch, and repeat. ( I like fusion welding and I do it when I can, but sometimes the job is complicated - for me, on that day - and so then I use filler .... BUT I hammer my filler flat, so it acts like thin filler and goes on really flat.... eh? ) 2_0020 copy.jpg I hammer my metal until it is really flat and then I don't have to file much. I'd rather planish than I would metal finish. But I file to check my work - and to make sure the painter sees that it is checked. 1_0039 copy.jpg
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#8
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Thanks again, I went back after it today and was able to finish without pick up the Mig.
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Ernie Franzen Queen Creek, AZ |
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