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  #21  
Old 09-19-2012, 12:25 AM
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I guess those engineers should be more thoughtful and not so damned defiant.
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  #22  
Old 09-19-2012, 03:03 AM
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Quote:
thanks for the help everyone
Good/glad to hear it/things worked out for your project.

Now about engineers or those with the power to say, "this is what and how you are going to do this task", if I feel through my past experience, tribal knowledge or something from the SRM, MM, or FSRM, I push back as hard as I can. If that does not work, they can do it themselves. ( and I've used that card before) In the end, it came back to me as, how did you know that would happen.
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  #23  
Old 09-20-2012, 01:08 PM
FabberMcGee FabberMcGee is offline
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My brother was for many years the foreman in the largest sheet metal fab shop in town. They did a lot of stainless counter tops, custom commercial sinks and big range hoods.

He told me they just aligned the parts very carefully and put a tiny tack about every 6 inches, then a tiny tack midway between them and again between those. Just continue the process until there are no spaces and all the tacks are over lapping. It takes time, but after sanding and polishing, there is no warping and no sign of a joint. I've seen some beautiful jobs come out of that shop.
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  #24  
Old 11-23-2012, 01:43 PM
o7oBaseMetal o7oBaseMetal is offline
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Quote:
Originally Posted by FabberMcGee
My brother was for many years the foreman in the largest sheet metal fab shop in town. They did a lot of stainless counter tops, custom commercial sinks and big range hoods.

He told me they just aligned the parts very carefully and put a tiny tack about every 6 inches, then a tiny tack midway between them and again between those. Just continue the process until there are no spaces and all the tacks are over lapping. It takes time, but after sanding and polishing, there is no warping and no sign of a joint. I've seen some beautiful jobs come out of that shop.
So, by "tack" are you saying that they didn't achieve full penetration and as a result didn't require back purge? Or are you meaning "tack" as very short, fully penetrating welds?
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  #25  
Old 11-23-2012, 01:55 PM
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This is what I have done.

Put a 1" break from each end, down on each end to be welded.

Short welds with a back skip, they heat shrink as needed.
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  #26  
Old 11-23-2012, 06:52 PM
FabberMcGee FabberMcGee is offline
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They make a full penetration weld and I imagine with back gas, just very short and as quickly as possible. Like maybe just a little round puddle or two and a touch of filler. I haven't done it myself, my eyes don't work that well even with glasses.
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  #27  
Old 11-23-2012, 07:16 PM
o7oBaseMetal o7oBaseMetal is offline
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Ok. I was thinking they do the top and bottom separate with light tacks that dont fully penetrate- just enough to leave a sanitary surface but not enough to really shrink or sugar.
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  #28  
Old 11-24-2012, 03:19 PM
FabberMcGee FabberMcGee is offline
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The size of the weld is so small there really isn't enough shrinkage to warp the sheet. The tacks are so far apart that it cools before the next one is made nearby.
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