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15th June 2015, 06:02 PM #1Senior Member
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Which join method gives Strongest bond?
Which of the following two welds give strongest bond/join for each of the 4 sides? Is there any real difference? Im about to make a rectangular tube out of 3mm sheet cut pieces with my little 130a arc welder, it has to be a specific size & there are no stock tubes close enough. It can't be welded inside the tube, but a few mm of sides isn't an issue. Thanks.
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15th June 2015, 06:31 PM #2GOLD MEMBER
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Hi, for max strength I would do similar to the first sketch but make the corners touch as in a V. You would gain max penetration, and have a neat finish on your welded tube. How long will the piece be? As welding it, could be a problem with distortion, if not done correctly.
Kryn
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15th June 2015, 07:50 PM #3SENIOR MEMBER
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+1 for the outside fillet if you want max strength. The catch is the metal at the root of the join will be quite thin (or open depending on fit-up), which might prove a challenge in avoiding blow-through.
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15th June 2015, 09:32 PM #4GOLD MEMBER
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As others have mentioned, outright strength is but one factor in choosing a joint. A bit more information about dimensions and actual application would assist in giving you the best answer. For exanple, your second joint design would excell if no internal penetration were allowed and would be the easiest to maintain dimensional tolerances while giving excellent strength, but it is a somewhat ugly and clunky looking joint in comparison to a well executed outside corner joint.
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15th June 2015, 11:48 PM #5SENIOR MEMBER
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Only issue with trying to do the outside corner joint as being discussed above is that arc welding the 3mm material will test your skills. Depending on the application #1 or #2 from your drawing might actually be a better option just from a practicality/frustration point of view.
How long does the tube need to be? and how straight does the tube need to be after you've finished welding it? Does the tube need to have continuously welded seams? If you haven't already - consider distortion and how you're going to keep it all straight.
what dimensions are we talking about? Can you join 2 bits of angle iron and halve the amount of welding?
Cheers
- Mick
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16th June 2015, 03:04 PM #6Senior Member
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from my experience the fillet weld would come out more consistent and possibly stronger.
good little shelf to run a bead along : )
my fillets always look better than flat /horizontals/ vertical butts
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16th June 2015, 05:56 PM #7Senior Member
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16th June 2015, 08:27 PM #8GOLD MEMBER
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17th June 2015, 10:37 AM #9Senior Member
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My vote is for outside corner. But realistically any of those joints should be more than strong enough for a little fabbed tube like that. For neatness' sake if you don't want to try an outside corner I'd go with your original butt. You could even (part) bevel the join so that the weld sat more or less flush with the surface and get more strength too.
I reckon if you tacked all over and then staggered a bunch of short welds well you could get by with minimal distortion.
When you say "it has to be a specific size", is 65mm x 35mm tube too far removed from what you need?
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17th June 2015, 05:59 PM #10Senior Member
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