OK, I am about to begin an argument with my company (Older employees and
shop personel) about the fact that they want us to have Dual dimensions in our
weld symbols. They have already been doing this for years but our
welds have never been real accurate callouts. And we already add a
"crosshatch" to show where the weld goes (this is another issue I
have but I am starting small on my arguments this time). Yes our drawings are
all dual dimensioned so they assume they want the welds also dual dimensioned.
I'm not sure what their arguments are going to be when we sit down but I can
only imagine.

I looked in the AWS A2.4:2012 standard and found:

6.16 U.S. Customary and SI Units. The same system that is the standard for
the drawings shall be used on welding symbols. Dual units shall not be used on
welding symbols. If it is desired to show conversions from SI to U.S. Customary
Units or vice versa, a table of conversions may be included on the drawing.

So, the way I read this is that no matter how the drawing is dimensioned,
the welds should never be dual dimenioned but only use the primary unit of
measure on the drawing. And if a conversion is needed, to do that conversion by
either adding a chart for the user to convert or refer to the AWS A1.1, Metric
Practice Guide for the Welding Industry.

Any and all input to help me in my quest would be greatly appreciated. I
think I will need more agument points to bring up when I get this meeting as
there are a lot of old school hard headed thinkers of :we have done it all
these years so why change now"

Also, the two major solid modeling packages we use, both do not use a dual
dimensions weld, nor do they even allow the option to create one without making
special symbols (which we have done before) and this is just fueling me more to
drive this change of being correct from here on forward.

Thanks,

Shane Villafuerte