Weld contour within tolerances
Weld contour within tolerances
(OP)
Do welds have to meet the bulk dimensions and tolerances of the part? Intuitively, I thought that weld beads would only have to meet if the weld symbol indicates a flat or concave contour. If the weld symbol indicates a convex contour, which is the default, I'm used to seeing big rugged weld beads that go weld beyond tolerance boundaries. These bead sizes are still limited by tolerances on the weld symbol and associated codes and welding procedures, but not by the diameters, flatness, etc, of the parts being welded together. I always assumed there was something in the standards that allowed that, but I couldn't find anything in AWS A2.4 or ASME Y14.5. Any thoughts?





RE: Weld contour within tolerances
Any other standards are followed on the part drawings before they are added to the weldment dwg. This is how it has been done at every company I have worked at.
Others may have come up with other ways.
Chris
SolidWorks 10 SP4.0
ctopher's home
SolidWorks Legion
RE: Weld contour within tolerances
Figure 9 in ASME Y14.24 shows a flush weld contour, thereby avoiding the problem. But what if there was no contour symbol, so that a convex or slight fillet shape was acceptable? Would the weld bead still have to lie within the 4.57±0.25 tolerance band of the flange? My experience says no, but I've been challenged on this and I can't find standards to support this interpretation.
RE: Weld contour within tolerances
RE: Weld contour within tolerances
To my mind, a flush contour symbol would mean no, a convex contour would mean yes.
RE: Weld contour within tolerances
If the weld needs to be the part dia, a separate machining dimension should be added after weld.
Chris
SolidWorks 10 SP4.0
ctopher's home
SolidWorks Legion
RE: Weld contour within tolerances
RE: Weld contour within tolerances
Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services
www.infotechpr.net
RE: Weld contour within tolerances
When 2 parts welded end to end Either Butt weld or Groove weld given (for Groove weld Chamfers made in both parts) .So its easier to maintain the part dimension.
NX 6.0.2.8 MP4
Teamcenter 2007
WINDOWS XP (64 Bit)
RE: Weld contour within tolerances
RE: Weld contour within tolerances
Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services
www.infotechpr.net
RE: Weld contour within tolerances
if you read my earlier posts in this thread, you will see that we are not making separate part and assembly drawings. The top section in my sketch is an example of what would appear on the weldment drawing, and all dimensions apply at the weldment level.
The 0.062 dimension is an arbitrary example. My point is that an ID bump far beyond the ±0.010 tolerance would be permitted. This is a normal feature of welds called "drop-through." On a long pipe, it's awfully hard to go in after the weld and machine down the ID.
RE: Weld contour within tolerances
Add the weld info on the drawing, then a dimension for the machined ID with a note to be machined after the weld.
Chris
SolidWorks 10 SP4.0
ctopher's home
SolidWorks Legion
RE: Weld contour within tolerances
Chris
SolidWorks 10 SP4.0
ctopher's home
SolidWorks Legion
RE: Weld contour within tolerances
Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services
www.infotechpr.net
RE: Weld contour within tolerances
RE: Weld contour within tolerances