tegwin
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| posted on 31/12/06 at 12:29 PM |
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Welding with gaps?
Here is the dilema...
I have tack welded bits to my chassis and they are in the right place...however there is a small airgap on a couple of the mating edges where I
miscalculated or mismeasured....to rectify the situation would take hours and weeks....will I loose much strength if I weld over the airgap and bridge
it with weld?
All of the joints have some metal to metal contact, there are no bits floating in midair that want connecting!
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Wadders
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| posted on 31/12/06 at 12:38 PM |
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No none at all, just more likely to blow through if not carefull.
In thicker metal its common to leave a gap to aid root penetration.
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arcoavon
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| posted on 31/12/06 at 12:38 PM |
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hi i am a welder by trade, so long as the gaps are small it is not a problem, in fact in certain cases we leave a small gap to ensure maximum weld
penetration, hope that puts your mind at rest !
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tegwin
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| posted on 31/12/06 at 12:41 PM |
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What is classed as a small gap?
Its hard to explain, but due to the way that the chassis has been bent (its tubular) there are notches where the rollers have been on the
bender....the box section I want to weld on sits with an edge either side of this notch....but there is about a 3-4mm airgap in the middle of the box
where the dip in the parent tube is....
I was thinking about making up some gussets/webbing to reinforce the weld...im just not sure how strong a welded joint is...
Would I be better off getting it stick welded so it fills the gaps better...rather than trying to use a wire feed mig?
(oh, and its stainless if it makes any difference)
Thanks.
Dunc
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Wadders
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| posted on 31/12/06 at 01:03 PM |
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Its easier to fill gaps with mig than stick, and your not likely to get slag inclusions either. just pulse the trigger and fill the gap first with
small amounts of weld, then run a fillet over the top.
Originally posted by tegwin
What is classed as a small gap?
Its hard to explain, but due to the way that the chassis has been bent (its tubular) there are notches where the rollers have been on the
bender....the box section I want to weld on sits with an edge either side of this notch....but there is about a 3-4mm airgap in the middle of the box
where the dip in the parent tube is....
I was thinking about making up some gussets/webbing to reinforce the weld...im just not sure how strong a welded joint is...
Would I be better off getting it stick welded so it fills the gaps better...rather than trying to use a wire feed mig?
(oh, and its stainless if it makes any difference)
Thanks.
Dunc
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thunderace
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| posted on 31/12/06 at 01:08 PM |
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i am doing a course on welding and i angle the ends of tubes a little and push the weld to get better penetration you can do a second pass over you
weld also.
see this site (i take it you are useing a mig )
http://www.mig-welding.co.uk/
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Jebus
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| posted on 1/1/07 at 01:23 AM |
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im at collge studing for my NC in welding, and doing root runs all the time, its easy on mig just turn power down a bit and pulse the trigger. not
much use 2 you be for a V butt joint wee get told 2 use a 3mm gap with a 2/3mm root face on stick and it dont blow holes so mig be fine for something
that size
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