looking for very basic weld info
looking for very basic weld info
(OP)
I have a few questions regarding welding and how it is specified on drawings. I've checked a few texts but haven't quit gotten exactly what I'm looking for.
First off, fillet and butt welds. Do they always have some filler material which is added or are the pieces just melted together? How do you use the weld symbol to to specify what the filler material should be?
Second, if I want to weld two plates end to end with a V butt weld, do I design the two plates to have the chamfered edges or does specifying a V weld through the weld symbol imply that the welder modify the plates in order to add the V shape to the edges?
Lastly, if I have a sheet metal part which is to be slid into a "trough" of another part and want to weld the two together, is it a fillet weld and does it require filler or is it a seam weld I am looking for where I'd weld straight through the sheet and melt it to the bottom of the "trough".
I know these are really basic but all I've come up with is are descriptions of the weld symbols and how the different processes work (Laser, resistance, etc).
First off, fillet and butt welds. Do they always have some filler material which is added or are the pieces just melted together? How do you use the weld symbol to to specify what the filler material should be?
Second, if I want to weld two plates end to end with a V butt weld, do I design the two plates to have the chamfered edges or does specifying a V weld through the weld symbol imply that the welder modify the plates in order to add the V shape to the edges?
Lastly, if I have a sheet metal part which is to be slid into a "trough" of another part and want to weld the two together, is it a fillet weld and does it require filler or is it a seam weld I am looking for where I'd weld straight through the sheet and melt it to the bottom of the "trough".
I know these are really basic but all I've come up with is are descriptions of the weld symbols and how the different processes work (Laser, resistance, etc).





RE: looking for very basic weld info
go to
https://ssl.lincolnelectric.com/foundation/
They have books there that will answer all of your questions.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: looking for very basic weld info
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Berkshire - Thanks, I have a copy but didn't know where to get another one for colleagues.
rmw
RE: looking for very basic weld info
Your questions are appropriate and represent the beginning of your education, but if they represent your level of experience, then you need more training before signing off drawing where lives and safety (mechanical, structural and product failures) are possible if your specified welds fail. I applaud your diligence in getting help, in recognizing you need training, but don't assume you have the detailed knowledge about welding to decide what to put in a weld symbol for any critical or important product. Yet.
It will come.
RE: looking for very basic weld info
RE: looking for very basic weld info
Regards,
Mike
RE: looking for very basic weld info
Kudos to you for recognizing that a note just doesn't cut it, and trying to learn more. I plan on getting a couple welding certs just so that I can better learn what I'm really asking for.
RE: looking for very basic weld info
There is a big gap between a "welded construction" note and selecting the most fabrication economical weld detail. Most engineers try to fall somewhere in the middle. It is most important that the final weld provide adequate strength. I frequently see insufficient weld information, which can result in grossly inadequate welds. And frequently after welding, the differences can only be determine by NDT.
http://www.FerrellEngineering.com
RE: looking for very basic weld info
RE: looking for very basic weld info
First off, fillet and butt welds. Do they always have some filler material which is added or are the pieces just melted together? How do you use the weld symbol to to specify what the filler material should be?
Response: Either or, depending on the process of welding, but the majority is with a filler material.
Second, if I want to weld two plates end to end with a V butt weld, do I design the two plates to have the chamfered edges or does specifying a V weld through the weld symbol imply that the welder modify the plates in order to add the V shape to the edges?
Response: Assuming your V-butt is the full thickness then you do not have to design anything as it is assumed that the strength of the weld is the same as the thickness of the material. If only partial groove then your weld needs to be designed. V symbol will require that the pieces be chamfered prior to welding. (Note that a simple V symbol is full thickness unless a partial thickness is specially defined next the the symbol).
Lastly, if I have a sheet metal part which is to be slid into a "trough" of another part and want to weld the two together, is it a fillet weld and does it require filler or is it a seam weld I am looking for where I'd weld straight through the sheet and melt it to the bottom of the "trough".
Response: A bit too vague. Sheet metal in my experience is very thin, so fillet would probably be out. Seam weld sounds like a better fit.
@berkshire and rmw: Thanks for the links, will have to order me one of those books.
RE: looking for very basic weld info
It is a good primer for someone that needs some basic information about welding and especially welding symbols.
Best regards - Al