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Unread 01-25-2011, 10:09 PM   #46
red rubi
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Quote:
Originally Posted by lumpster View Post
I was actually thinking i was going to go with 6 gauge, and 50 amp breaker just ot be on the safe side. sounds like i might have guess right!
That's the right way to do it.

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Unread 01-25-2011, 10:16 PM   #47
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Unread 01-25-2011, 10:36 PM   #48
Pikes_Peak_Trailers
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Quote:
Originally Posted by Krochus View Post
I've never seen multiple passes employed for any other reason than to achieve the desired weld size or volume. For example as per our specified weld procedure you can make no larger than a 5/16" fillet in a single pass using FCAW-G or SMAW, 5/16 fillets are most common but 3/8 or even 1/2 aren't unheard of.

Now the welds above are a bit diffrent in that they're a "full penetration" weld. Meaning the members to be joined are welded homogeneously throughout 100% of the joint thickness. This odviously takes more than one pass.

So to answer you'd specific questions the answers are yes.
Gotcha.

Let me ask you from a different perspective - how would one do a multi-pass incorrectly? What are the signs of a poor multi-pass?

Thanks in advance.
Dave.
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Unread 01-25-2011, 11:03 PM   #49
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Quote:
Originally Posted by Pikes_Peak_Trailers View Post
Can you describe, or point me to resources that discuss/detail using multi-pass to increase strength? In other words, instead of just running another bead on top or contiguous, what are the strategies to produce the strongest weld when multi-passing. If I were in a class, I would ask:

1) Should you run the first and subsequent beads at the same power/speed?
2) Is there a geographic strategy to where you lay the initial and subsequent beads?
3) etc.

My interest in this topic is primarily for strength, not aesthetics.

Thanks.
Dave.
Here's a multiple pass fillet weld...

Plates tacked together...



Root pass...





First pass (bead) of the second layer...note how it overlaps the root pass by about 50%...



Here, I've skipped ahead. This shows the completed 2-pass second layer, and the completed 3-pass third layer. Of course, I've staggered the craters so that you can see the bead sequence. The beads all overlap the previous bead by about 50%. This is known as a "toe-to-crown" technique.







This size weld is way overkill for the thickness of this material, but hopefully, you get the idea of how it's done.

Rich
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Unread 01-25-2011, 11:05 PM   #50
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Originally Posted by Kenbo-Slice View Post
First pic is .065 tubing, 2nd is 1/8" plate beveled both sides @45deg root welded and filled. There is GOOD penetration haha.



That depends 100% on the individual behind the torch my friend!

For the record those welds are with a Miller synchrowave 250ds.
I may have worded that bad. what I was getting at was your welds were tig and the one on the posts after were mig. And a mig wont make a weld that looks like your welds. I was not trying say your welding was bad. Just wanted the new welders to know how inportant penitration is.
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Unread 01-25-2011, 11:10 PM   #51
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Originally Posted by Pikes_Peak_Trailers View Post
Gotcha.

Let me ask you from a different perspective - how would one do a multi-pass incorrectly? What are the signs of a poor multi-pass?

Thanks in advance.
Dave.
Visually

Uneven weld profile, rolled passes, undercut of the top leg and voids between pass tie in.

RT or UT

Inclusions, porosity and cracking

When making large welds you also have to preheat to the specified temp and manage you heat input so as to not exceed the maximum interpass temperature (most often 450)
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Unread 01-26-2011, 05:49 AM   #52
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Getting warmed-up...


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Unread 01-26-2011, 06:53 AM   #53
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Originally Posted by ktmman656 View Post
Just foolin around praticing plug welds
Do you have heroin addict forearms???

I have a friend that welds with short sleeves and flip flops. Funniest looking feet you will ever see.
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Unread 01-26-2011, 12:20 PM   #54
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What is this? Art?
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Unread 01-26-2011, 12:25 PM   #55
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jeff from rokmen needs to post in here
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Unread 01-26-2011, 02:04 PM   #56
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Originally Posted by jatepper View Post
Do you have heroin addict forearms???

I have a friend that welds with short sleeves and flip flops. Funniest looking feet you will ever see.
ive only welded once with sleaves and i caught on fire so i go T-shirts
ive caught on fire three time while welding sleave listed bofre ember went in boot and lit sock, and i was doing overhead welding and didn't notice i was on fire till my friend through watter on me
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Unread 01-26-2011, 02:15 PM   #57
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Quote:
Originally Posted by rixcj View Post
Here's a multiple pass fillet weld...

Plates tacked together...



Root pass...





First pass (bead) of the second layer...note how it overlaps the root pass by about 50%...



Here, I've skipped ahead. This shows the completed 2-pass second layer, and the completed 3-pass third layer. Of course, I've staggered the craters so that you can see the bead sequence. The beads all overlap the previous bead by about 50%. This is known as a "toe-to-crown" technique.







This size weld is way overkill for the thickness of this material, but hopefully, you get the idea of how it's done.

Rich
I cannot thank you enough for those pics. If you did them just for me, I def owe you a six pack.

Ok....here's one more and I think it may be most important question:

When do you know when you need to double pass? Do you only go by the guidelines in the welder manual or are there other clues/facets that provide the answer?

I multi pass any joint that is critical and thicker than 1/8th....like here the tongue/keel of my trailers join the chassis. But I do this out of being paranoid more than anything else. My single passes have very good penetration but I multi anyway.

So, when do you know when to multi?
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Unread 01-26-2011, 02:17 PM   #58
Pikes_Peak_Trailers
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Quote:
Originally Posted by Krochus View Post
Visually

Uneven weld profile, rolled passes, undercut of the top leg and voids between pass tie in.

RT or UT

Inclusions, porosity and cracking

When making large welds you also have to preheat to the specified temp and manage you heat input so as to not exceed the maximum interpass temperature (most often 450)
Thank you very much.
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Unread 01-26-2011, 02:29 PM   #59
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Great stuff guys, keep it up. Not only a "fabricators porn" thread it's also educational.


RARE!
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Unread 01-26-2011, 02:53 PM   #60
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Quote:
Originally Posted by ktmman656 View Post
ive only welded once with sleaves and i caught on fire so i go T-shirts
ive caught on fire three time while welding sleave listed bofre ember went in boot and lit sock, and i was doing overhead welding and didn't notice i was on fire till my friend through watter on me
Buy a welding jacket/shirt


Quote:
Originally Posted by mg2000xj View Post
What is this? Art?
I was wondering the same thing. By the ball point pen in the first pic it is something very small. Lots of talent to make welds on that scale look good!
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