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Posted by Ecnerwal on April 21, 2008, 2:22 pm
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In article
> I have used overlaping circles befor and red that this should not be
> used, just a back and forth motion. Which is right?
As your reading should tell you, the overlapping motion increases the
chance of trapping slag in the bead. For structural welding, I recall
that no weave at all was the correct method as taught in class - lay a
stringer, clean off all the slag, lay another stringer. But I've never
gone on to actually applying that (ie, welding for other people, for
money, in a structural setting with certifications and inspections and
all that stuff).
For "sticking stuff together", you can do whatever you like, but when
the stuff needs to be stuck together well, it is worthwhile to use
"good" techniques as developed by years of experience and failure
analysis. Without fancy X-ray equipment, you can't see slag inclusions
if they are not sticking out the surface of the weld, so trying to avoid
the possibility of causing them is good practice.
--
Cats, coffee, chocolate...vices to live by
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Posted by stryped on April 21, 2008, 2:56 pm
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wrote:
> In article
>
> > I have used overlaping circles befor and red that this should not be
> > used, just a back and forth motion. Which is right?
>
> As your reading should tell you, the overlapping motion increases the
> chance of trapping slag in the bead. For structural welding, I recall
> that no weave at all was the correct method as taught in class - lay a
> stringer, clean off all the slag, lay another stringer. But I've never
> gone on to actually applying that (ie, welding for other people, for
> money, in a structural setting with certifications and inspections and
> all that stuff).
>
> For "sticking stuff together", you can do whatever you like, but when
> the stuff needs to be stuck together well, it is worthwhile to use
> "good" techniques as developed by years of experience and failure
> analysis. Without fancy X-ray equipment, you can't see slag inclusions
> if they are not sticking out the surface of the weld, so trying to avoid
> the possibility of causing them is good practice.
>
> --
> Cats, coffee, chocolate...vices to live by
So you were taugth to just use a straight motion?
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Posted by Ecnerwal on April 21, 2008, 3:49 pm
Please log in for more thread options In article
> So you were taugth to just use a straight motion?
For structural, critical work, yes. For things like padding and
hardfacing, an S or 8 (but not looping the loops) weave was taught. That
would be the "side-to side" pattern.
--
Cats, coffee, chocolate...vices to live by
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Posted by stryped on April 21, 2008, 4:20 pm
Please log in for more thread options wrote:
> In article
>
> > So you were taugth to just use a straight motion?
>
> For structural, critical work, yes. For things like padding and
> hardfacing, an S or 8 (but not looping the loops) weave was taught. That
> would be the "side-to side" pattern.
>
> --
> Cats, coffee, chocolate...vices to live by
What size rod would you use for joining 1/4 inch thick 4x4 tubing
together? 1/8? WOuld a straight motion cover both sides?
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Posted by Ecnerwal on April 21, 2008, 6:05 pm
Please log in for more thread options In article
> What size rod would you use for joining 1/4 inch thick 4x4 tubing
> together? 1/8? WOuld a straight motion cover both sides?
1/8 is what I stock most of and mostly run, so for a low-volume project
I'd probably use that. I'd have to spend more time practicing with
larger rod to get myself dialed in on not making more of a mess with it.
The way that stringers are done, it's not a matter of filling the vee in
one pass. You weld a root pass, clean the slag, run a stringer, clean
the slag, etc. Each stringer gets full penetration into the parent metal
and a previous stringer bead (or into two previous stringer beads),
until all is full.
Miller suggests that weaving is OK up to 2-1/2 times electrode diameter,
but the recall I have from class is that it is not allowed in some
structural codes.
http://www.millerwelds.com/education/articles/articles16.html
--
Cats, coffee, chocolate...vices to live by
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> used, just a back and forth motion. Which is right?