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tech / sci.engr.joining.welding / Re: Al-GMAW - straight run or whipping motion?

Al-GMAW - straight run or whipping motion?

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From: nul...@void.com (Richard Smith)
Newsgroups: sci.engr.joining.welding
Subject: Al-GMAW - straight run or whipping motion?
Date: Wed, 21 Jul 2021 07:05:13 +0100
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by: Richard Smith - Wed, 21 Jul 2021 06:05 UTC

Hi again

Al-GMAW

Some say - straight run
Others say - weave or "whip"

You say??

Rich S

Re: Al-GMAW - straight run or whipping motion?

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From: muratla...@gmail.com (Jim Wilkins)
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Subject: Re: Al-GMAW - straight run or whipping motion?
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by: Jim Wilkins - Wed, 21 Jul 2021 16:12 UTC

"Richard Smith" wrote in message news:lybl6w2odi.fsf@richards-air-2.home...

Hi again

Al-GMAW

Some say - straight run
Others say - weave or "whip"

You say??

Rich S

--------------------

https://www.mig-welding.co.uk/forum/

Re: Al-GMAW - straight run or whipping motion?

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From: nul...@void.com (Richard Smith)
Newsgroups: sci.engr.joining.welding
Subject: Re: Al-GMAW - straight run or whipping motion?
Date: Thu, 22 Jul 2021 21:39:30 +0100
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by: Richard Smith - Thu, 22 Jul 2021 20:39 UTC

"Jim Wilkins" <muratlanne@gmail.com> writes:

> "Richard Smith" wrote in message news:lybl6w2odi.fsf@richards-air-2.home...
>
> Hi again
>
> Al-GMAW
>
> Some say - straight run
> Others say - weave or "whip"
>
> You say??
>
> Rich S
>
> --------------------
>
> https://www.mig-welding.co.uk/forum/

Latest - running smoothly
5083 Al plate 6mm thickness
5356 GMAW wire 1.2mm (47thou") diameter
in spray at
9.8m/min
(385"/min)
and about 22.8V reported.
Smooth run, no manipulation.
Looks good. Is good?

Only remaining problem is the restarts. Often burn-back to the torch
/ contactor tip. Blob of Al against contactor tip which prizes off
without harm if quick off the trigger.
Not yet worked out how to avoid that.

If I could solve that, I'd be doing rather well.
No other problems remaining

I'm left totally puzzled why Pulse is used on this 6mm thickness when
you'd be a "clean" spray anyway...

In spray doing overhead - 4F/PD - no metal ejection, not getting
burned.
Basis to insist on CV spray, as getting covered in burns using Pulse,
which was ejecting a drop of spatter per pulse.

Now finding every other position good.

I was worried the weld beads are too smooth suggesting excessive heat
input - but
- am on only about 210A to 220A (Linc.Elec. A for 9.8m/min with
1.2mm-dia wire) at just under 23V - low-end of L.E. volts range.
- any drop in V by a tiny amount or wire-feed-speed / Amps causes a
coarse unwetted bead and raspy arc - only just in spray
indicate the concern is misplaced - the beads are smooth and that is
the way it is not problem (the reference state being Pulse welded bead
appearance)

Rich S

Subject	Author
Al-GMAW - straight run or whipping motion?	Richard Smith
Re: Al-GMAW - straight run or whipping motion?	Jim Wilkins
Re: Al-GMAW - straight run or whipping motion?	Richard Smith