Originally Posted by Pikes_Peak_Trailers
Can you describe, or point me to resources that discuss/detail using multi-pass to increase strength? In other words, instead of just running another bead on top or contiguous, what are the strategies to produce the strongest weld when multi-passing. If I were in a class, I would ask:
1) Should you run the first and subsequent beads at the same power/speed?
2) Is there a geographic strategy to where you lay the initial and subsequent beads?
My interest in this topic is primarily for strength, not aesthetics.
Here's a multiple pass fillet weld...
Plates tacked together...
First pass (bead) of the second layer...note how it overlaps the root pass by about 50%...
Here, I've skipped ahead. This shows the completed 2-pass second layer, and the completed 3-pass third layer. Of course, I've staggered the craters so that you can see the bead sequence. The beads all overlap the previous bead by about 50%. This is known as a "toe-to-crown" technique.
This size weld is way overkill for the thickness of this material, but hopefully, you get the idea of how it's done.
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