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Tool Talk Discussion Forum

Re: Weld symbol question

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Stick welding

04-12-2013 23:52:40

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It's been awhile for welding symbols for me too. If the welds are staggered in between each other from one side to the other, they should be staggered in the symbol like in the 3rd diagram. Unless it's a T joint, you wouldn't have a fillet on both sides. I could see a corner joint that had a fillet on the inside and one piece fits over the other piece leaving a butt weld on the outside corner. A picture showing how the pieces go together would help to identify the correct weld symbol.

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jason the red

04-13-2013 07:07:27

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 Re: Weld symbol question in reply to Stick welding, 04-12-2013 23:52:40  
The weld symbols they had used were correct. The first weld required two fillet welds and the second weld required a fillet weld and butt weld, I was primarily concerned with the spacing. In both welds (the double fillet and the fillet/butt) the symbols showed welds opposing each other with a note stating the welds were to be staggered. However, the welds were not layed out consistantly. The first weld was layed out 3-6 staggered, and the second was layed out 3-3 staggered.

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04-13-2013 09:05:22

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 Re: Weld symbol question in reply to jason the red, 04-13-2013 07:07:27  
Draftsmen and engineers often misuse or are a little lazy in noting weld symbols on drawings. If a staggered sequence is required, the symbols should be shown as staggered even though the note in the tail does say stagger welds.
Jason the Red's top layout is correct in how it describes the weld layout, however, the center layout is incorrect. Length and spacing stay on the respective side. In other words, staggered spacing dimension of 6" would not jump from the center of the opposite side to the center of the weld on the near side.
Below is a picture of a typical slide we could use during Welder Workmanship Training for Navy contracts. Website will not permit actual document attachment

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Stick welding

04-13-2013 14:36:12

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 Re: Weld symbol question in reply to forty40, 04-13-2013 09:05:22  
Just looked at your drawing again. The 1/4" penetration on the butt weld most likely required a V in plates and that should have been shown on the weld symbol rather than just a butt weld symbol.

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Stick welding

04-13-2013 14:13:59

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 Re: Weld symbol question in reply to forty40, 04-13-2013 09:05:22  
Jason's top layout would be correct if the welds were opposite each other but being they were meant to be staggered from one side to the other, the symbols should have been staggered just like in your diagram. I would think welding symbols could give the draftsmen fits sometimes. That's why it's always good if there's some additional information to help you figure out what they want. Being a welder you could encounter a blueprint with a symbol or specific type of weld you've never seen before. Welding symbols can get pretty involved and sometimes even complicated. I've seen mistakes on blueprints as well where the weld doesn't match the joint or the arrow side is wrong.

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jason the red

04-13-2013 16:49:12

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 Re: Weld symbol question in reply to Stick welding, 04-13-2013 14:13:59  
This is pretty much my ideas. I think the engineer either was confused or didn't know what he was doing. I wish I could have just taken a picture of the print to show you guys, but the work is proprietary and losing my job isn't worth it. The part that worries me the most is the inconsistancy in layout between seemingly similar weld symbols (despite one being a double fillet and one being a butt and a fillet).

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welding man

04-13-2013 07:14:25

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 Re: Weld symbol question in reply to jason the red, 04-13-2013 07:07:27  
I have often wondered over the years why some engineers have things welded the way they do. They are not always right,because you do have weld failures due to poor design and improperly placed welds. Some times a little common sense goes a long way when welding things.

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