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Thread: Pretty welds
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1st Aug 2010, 05:01 PM #1Dave J Guest
Pretty welds
Hi,
On another forum I came accross this thread on pretty welds and thought you guys might want to take a look. There are 90 something pages of it.
Here is a picture of one of the welds below, enjoy
"http://www.race-dezert.com/forum/showthread.php/59124"
Dave
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1st Aug 2010, 08:46 PM #2Golden Member
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Some very skilled welders out there!
I'm not really into the sharp stack of dimes look though, I'd much rather a tighter smoother effect - surely this is stronger, less prone to cracking too?
I thought this one was nice and simple
Cheers
- Mick
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1st Aug 2010, 09:11 PM #3Dave J Guest
I like the looks of that type of weld as well. The one I pictured above is done as a 2nd pass, and it would take some real talent to get that pattern so even.
From what I read on that thread was, the second pass made a stronger weld.
Dave
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1st Aug 2010, 09:31 PM #4
Mick,
I prefer your style to the BS stack o dimes.The overrated style of weld shows the ripples at a wider spacing than yours.
Your bead to my eye, indicates more filler strokes/mm. than what the yanks do with the stack o dimes technique.
It does not take a genius to see that the weld that has "smoother" along the ripples meaning a finer transition between each filler insertion stroke. The chances of a stress raiser become far less as the filler ripples are spaced closer together and blend more readily into the parent metal.
Have a good look at the first pic and that is a really decent bead-not stack o dimes, one where the filler has been made at the outer edges of each side of the bead.
The filler points are close to each other and do not show the distinctive sharp edge between each ripple. This changes the profile of the weld so it is higher and flatter in the section closer towards the edges and less hump in the middle of the bead section.
Again look carefully at the fillet structure on most stack o domes welds. There should be filler metal between the toes of the weld.A point to point line on these welds hits thin air.
Some of the welds are just show pony stuff because some welders ,not all mind you, have not done Weld Structure 101 Basics and have failed to understand the difference between a convex and concave fillet weld. bead.
Of course its just my humble opinion.
Grahame
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1st Aug 2010, 10:20 PM #5Golden Member
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Grahame - yeah I know what you mean - I was referring more to the millions of stacks of dimes welds on the site that Dave pointed out, rather that the embeded image. The images attached to this post are what I mean - really sharp transitions, etc which I don't like. The weld in my last post wasn't mine, but what I aspire to.
Dave - I didn't read though all the pages (or even a 10th of them!), but I reckon that image you had looks like a typical 'walk the cup' tig weld - I agree, pretty tricky on a tight radius like that. I would've thought that a single pass would've been ample for this weld though - wouldn't a second pass add more stresses?
Cheers
- Mick
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1st Aug 2010, 11:18 PM #6Dave J Guest
I fixed the link and made it clickable.
No use asking me I am a home shop welder not a profesional. I can lay some good welds but not perfect buy a long shot. The only sort of thing I have going for me is 2 boiler maker uncle's (one with tickets as long as your arm) and an 88 year old grandfather that has been a ship builder all his life but has never used mig. lol
Page 75 post 744 has that weld on it, here are the 2 picture and below are the coments after it.
Dave
Quote
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tripple- did you use filler on the 2nd pass?
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yup. Straight current and stepping the torch while laying .063 rod for the first pass and pulsing current and dipping the .063 for the second pass
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Amazing tig welds trippletripple!!!!!
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UnQuote
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1st Aug 2010, 11:28 PM #7Noobe
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1st Aug 2010, 11:29 PM #8
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1st Aug 2010, 11:35 PM #9Dave J Guest
I was wondering what was going on with the link.
Dave
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2nd Aug 2010, 12:38 AM #10
Daniel,
No,No,no!
The internet can be a good thing ,but there are lots out there who numb from the neck up and don't think and question for themselves.
I see so much wrong info represented as fact.In a lot of cases all it takes is a bit of knowledge and some analysis of how ,why,when and where people do whatever it is that they do.
In no way I am guru.
Guru - a hairy half naked bugger who lives in a cave.Perhaps I can be an Arc Angel for the forum lol
Most times like an Uber Curmudgeon, even on my best days.
Seriously, I do I get my jollies from assisting people (and students-some of them are people) to better the welding and fabb efforts.
Some times I'm off beam a bit ,I do often wonder if those are my bad sugar days.
I have only just got rid of the big pineapple the doc inserted for being a bad diabetic.I know how an alcoholic must feel.Can't help myself I keep sneaking the sugar,.
Cheers all
Grahame
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2nd Aug 2010, 12:51 AM #11
I agree entirely.
While I don't know the parent metal I dare say it its probably chromemoly, if its a roll cage. If you bung too much filler on a small pipe you bugger up the transitional angle from parent tube to the weld bead and the angles become more acute. That makes an automatic stress raiser and can be the source of a notch crack.
These guys have got the mechanics of welding down pat but neglected theory side which gets real practical in a high stress moment.Less can mean more!
Downstairs for dancing- upstairs for thinking -my uncle often used to say.
Lets keep improving the world -one bit at a time.
Cheers
Grahame
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2nd Aug 2010, 01:07 AM #12Noobe
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2nd Aug 2010, 08:35 PM #13Golden Member
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I reckon this is a pretty good site to learn how to spot some problems:
Miller - Ten Common TIG Problems: A Visual Guide
If it looks ugly, I reckon its probably bad:
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2nd Aug 2010, 09:26 PM #14
Hi Daniel,
It is mainly experience and observation. I have looked at a lot of welds and watched a lot of welders lay them down.Once you know what causes the characteristic it becomes fairly easy to read the welds.
Take the last one Mick has posted.
It is MMAW -a stick electrode end tack on a tee fillet.
The Amps setting is way too low.
It was welded using a longer arc but because the amps were too low it cut in and out leaving mini deposits one over the other.Odds on ,it was welded with a transformer type machine.
After I got to see a few of the welds I could Identify which students did certain welds most of the time.
Grahame
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2nd Aug 2010, 09:58 PM #15Dave J Guest
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