US commercial weld note

[KENAT]

So as some of you may recall I'm from the UK originally.

My question is this, what is the normal (or should that be correct) note for calling out welding on US commercial drawings.

In the UK for MOD work we had to reference the weld symbol spec, specify a process (usually a standard spec based on material type) and if I recall correctly specify the filler/rod standard.

AWS 2.4 covers symbology but for general commercial (not structural/pressure vessels etc) what else to you call out on the drawing?

I’ve done a couple of google searches and looked at the AWS website but the answer didn’t jump out at me.

Thanks…

 

[aardvarkdw]

I think (not certain/don't have a document that states this) that the practice is that you place the weld symbol (a line with a leader) and that tells the shop you want a weld, any other information just tells them what specificly you want.

In otherwords if you arn't picky about the size, method or appearance of the weld a "weld symbol" consisting of a line with a leader is sufficient. I at minimum spec the weld profile, but most of the time I spec a size and finish condition as well. I almost never spec a process unless I need it to be MIG or TIG, I leave that up to the welder to decide.

Don't know if this helps.

David

 

[Heckler]

Here is a great website for weld symbols

http://www.welding.com/weld_symbols_welding_symbols.shtml

Best Regards,

Heckler
Sr. Mechanical Engineer
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Never argue with an idiot. They'll bring you down to their level and beat you with experience every time.

 

[MechNorth]

As always, if you're drafting to a certain standard, you should note that standard on the drawing.

Jim Sykes, P.Eng, GDTP-S
Profile Services
CAD-Documentation-GD&T-Product Development

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[MintJulep]

I'm sure by now that you have found the AWS weld symbols.

Filler rod, welding maching settings and other process information are generally listed in a weld process procedure.

Depending on the complexity of your drawing, you can either reference the appropriate procedure in the tail of the weld symbol, or provide a table to cross reference weld types to procedures.

 

[KENAT]

Thanks for the replies although from a couple of the responses I think maybe I didn’t phrase my question well.

I found a copy of the notes I used in the UK (the standards referenced may be out of date as a lot of the BS have gone BS EN or BS EN ISO now).

1. Weld symbols comply with BS EN 22553.

Steel

2. Welding to be in accordance with BS EN 1011 Parts 1 & 2 using MIG or TIG process using filler rod to BS EN 440.

Stainless

2. Welding to be in accordance with BS EN 1011 Parts 1 & 3 using MIG or TIG process using filler rod to BS EN 440.

Alluminum

2. Welding to be in accordance with BS EN 1011 Parts 1 & 4 rods or filler to BS2901

For note 1 I’m happy that referencing AWS 2.4 (that I referenced in my OP) covers this, actually since we reference Y14.100 on our standard notes I arguably don’t need to call our AWS 2.4 specifically.

However, I’m concerned that I should also reference something equivalent to the notes 2 above and my US checker & I are having trouble determining exactly what. We don’t do any welding in house so don’t raise detail procedures, we just want to try and reference industry standard practices which the weld shop can use to guide their specific process. If it helps the specific drawing we are concerned about is aluminum.

We’ve had a problem that a part failed in the field and on examination was found it to have been held together by a single point of tack weld despite the drawing calling for a fillet all around on the drawing. It was an old drawing that didn’t reference AWS or Y14.100 or any weld standards, although the actual weld symbols are ok, so if we have to update it we want to make sure it’s correct. Once the drawing is correct (‘bullet proof’) then the rest is up to purchasing & QA to make sure it doesn’t happen again.