Weld symbol

[John12345]

Hi all, does this symbol mean it’s just welded on the near side? Or both sides? Thank you.

 

[Munkul]

Welded on the underside only, of where the arrow is pointing at.
The problem is, the arrow location is very vague! It could be either side. I think you need a technical query to verify it.

 

[John12345]

Thank you

 

[Erie Fred]

Welded on the underside only, of where the arrow is pointing at.
The problem is, the arrow location is very vague! It could be either side. I think you need a technical query to verify it.

Yes, I would put the symbol main body down lower, with the arrow pointing up if that is the surface desired.

Not on top, pointing down thru the material thickness to reach the far side.( which is what it appears to be)

Or, if in a tight area, leave main body up high, arrow goes down steeply to under the part, and then
back up to the material.

 

[Munkul]

Yes, I would put the symbol main body down lower, with the arrow pointing up if that is the surface desired.

Not on top, pointing down thru the material thickness to reach the far side.( which is what it appears to be)

Or, if in a tight area, leave main body up high, arrow goes down steeply to under the part, and then
back up to the material.

sometimes it's a bit difficult to convey the weld position, we often show welds on the wrong side with a “other side” symbol, as it’s the best way to give clarity. Other times it’s much better to give another exploded view with the joint details blown up a lot more.

 

[Mid Wales welder]

Symbol on the bottom means arrow side. Symbol on top means other side.
If there is a dashed line present then symbol on dashed line is other side and symbol on solid line is arrow side.

ISO 2553 gives details on this as per system A or system B.

 

[Erie Fred]

Symbol on the bottom means arrow side. Symbol on top means other side.
If there is a dashed line present then symbol on dashed line is other side and symbol on solid line is arrow side.

ISO 2553 gives details on this as per system A or system B.

Yes.
However, where is the arrow pointing to ?

 

[Erie Fred]

 

[Munkul]

Symbol on the bottom means arrow side. Symbol on top means other side.
If there is a dashed line present then symbol on dashed line is other side and symbol on solid line is arrow side.

ISO 2553 gives details on this as per system A or system B.

I think in that case we've always marked our welds on the wrong side then I'll check the standard today.

 

[bricol]

I think in that case we've always marked our welds on the wrong side then I'll check the standard today.

I think the revised standard with "system B" where there is no dashed line now confuses the issue - and you need to state on the drawing which part you are using - A or B.

How to admit, I've always been less than sure, having used both BS and American standards, depending on which side of the Atlantic my desk was - plus my current CAD system defaults to what seems like incorrect settings, but I suspect is set up to use System B before we realised.

I'm even more sure, despite whatever I put on drawings, our fabs mostly get whatever welding the person holding the torch thinks, rather than do as the drawing asks (if in doubt, ask), or indeed, call out the person with their initials on the drawing as being incorrect - only way to learn, for either of us, once we figure out who got it wrong.

I'm certainly going to be giving a drawing I was doing Tuesday a good looking at when I'm back in work on Monday.

This was posted by someone in an earlier thread about weld symbols, I forget who, but I saved the drawing, it being a very clear way to understand what a basic ISO symbol meant:

 

[Munkul]

Actually I'm being dumb, we do use the system "A" with the dash line correctly. I think we've had some drama with it in the past due to the americans doing it the other way.

 

[Mid Wales welder]

Yes.
However, where is the arrow pointing to ?

Hard to tell from the photo, but arrow line shouldn’t pass through joint anyway as if the weld is meant for the other side then it would just be designated as such on the reference line

 

[Mid Wales welder]

Actually I'm being dumb, we do use the system "A" with the dash line correctly. I think we've had some drama with it in the past due to the americans doing it the other way.

Yes it’s easy to be caught out, the one I hate is for stitched welds ISO has distance between welds in the brackets as spacing but AWS has it as centres

 

[Mid Wales welder]

I think the revised standard with "system B" where there is no dashed line now confuses the issue - and you need to state on the drawing which part you are using - A or B.

How to admit, I've always been less than sure, having used both BS and American standards, depending on which side of the Atlantic my desk was - plus my current CAD system defaults to what seems like incorrect settings, but I suspect is set up to use System B before we realised.

I'm even more sure, despite whatever I put on drawings, our fabs mostly get whatever welding the person holding the torch thinks, rather than do as the drawing asks (if in doubt, ask), or indeed, call out the person with their initials on the drawing as being incorrect - only way to learn, for either of us, once we figure out who got it wrong.

I'm certainly going to be giving a drawing I was doing Tuesday a good looking at when I'm back in work on Monday.

This was posted by someone in an earlier thread about weld symbols, I forget who, but I saved the drawing, it being a very clear way to understand what a basic ISO symbol meant:

View attachment 529091

Yes the drawing should always state which system is being used.
The main problem I see is where different systems are used in a workshop and know one has any idea what is going. Communication and consistency is key I think, yes most ‘get what is needed’ but then what’s the point in having symbols etc at all.