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Author: Subject: Opinions on my weld
Dean m

posted on 9/6/16 at 10:57 AM Reply With Quote
Opinions on my weld

Hi,
Before I start tacking together my chassis I would like a second opinion on my weld.
Had a play with some box section and the two photos show ( what I think ) is about the right setting on my welder.
Does it look like I've got the power setting and wire speed about right?
The next power setting up blows holes in the end of the box section really easily.
Thanks Dean



[img] Weld
Weld
[/img]


[img] Weld2
Weld2
[/img]

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ken555

posted on 9/6/16 at 11:00 AM Reply With Quote
Cut it at a 45 degrees thru the weld and look at the penetration






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John Bonnett

posted on 9/6/16 at 11:28 AM Reply With Quote
quote:
Originally posted by Dean m
Hi,
Before I start tacking together my chassis I would like a second opinion on my weld.
Had a play with some box section and the two photos show ( what I think ) is about the right setting on my welder.
Does it look like I've got the power setting and wire speed about right?
The next power setting up blows holes in the end of the box section really easily.
Thanks Dean



[img] Weld
Weld
[/img]


[img] Weld2
Weld2
[/img]



907 will provide the definitive answer but I'd be pleased with that.

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40inches

posted on 9/6/16 at 11:35 AM Reply With Quote
I would be more than happy with that
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loggyboy

posted on 9/6/16 at 12:27 PM Reply With Quote
As Ken said. Cut it and check penetration. A good looking weld on the outside is a good idea of how good it is, but no guarantee.





Mistral Motorsport

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MikeR
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Building: Slowcost since 2000, speeduino since 2020, Caterha

posted on 9/6/16 at 12:35 PM Reply With Quote
ideally you space the tube a mm away form the other one to help ensure pentration (it also means you can then see the pentration easily looking down the short tube). With 1.6mm (or 2mm in your case) tube hobby welders are powerful enough to weld without the gap in theory.

Weld does look ok - but the proof is in the cutting open.

An alternative approach is to cut through just over half the weld and start hitting the thing with a hammer - see what lets go first, the weld or the tube. If the weld goes and the tube is smooth you've not got penetration.

(nb this test was easier when i did my city and guilds 16 years ago as we used 5mm steel).

What does it look like looking straight down the open top tube?

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Dean m

posted on 9/6/16 at 01:51 PM Reply With Quote
Thanks for the replies.

Looking down the tube there is only slight penetration,
And cutting in half shows most of the weld sat on top.
I also cut open one of my other test welds on the next power up setting and the weld was slightly more on the inside.

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907

posted on 9/6/16 at 02:33 PM Reply With Quote
quote:
Originally posted by John Bonnett
quote:
Originally posted by Dean m
Hi,
Before I start tacking together my chassis I would like a second opinion on my weld.
Had a play with some box section and the two photos show ( what I think ) is about the right setting on my welder.
Does it look like I've got the power setting and wire speed about right?
The next power setting up blows holes in the end of the box section really easily.
Thanks Dean



[img] Weld
Weld
[/img]


[img] Weld2
Weld2
[/img]



907 will provide the definitive answer but I'd be pleased with that.




Who ?




On a more serious note I know nothing about hobby welders.
There is no such thing as "power" settings; only volts and wire speed.
If I'm given the volts, wire speed in m/min, wire diameter, and type of gas
I can replicate this on my own machine, otherwise I'm lost.

If I were to comment I would say that the speed of travels too slow,
allowing a huge build up. The weld leg length looks massive in comparison to
the material thickness.

Also if your welding 25 box the weld should be 25mm long. Practice starting
at the beginning and finishing at the end.

My advice is get an experienced welder to show you the basics; then practice.


There. Now everybody hates me for being honest.

Paul G

[Edited on 9/6/16 by 907]






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