aluminum welding issue

[SamSam]

The guideline says (in other words): "If the material thickness requires multiple weld passes, then the first two should be intermittent 75X75 mm overlapping. After that, the seam may be covered by a continous weld."

This recommendation is aiming at tight welds, not the intermittent welding of stringers etc as shown in SamSam's Picture, and has nothing to do with "saving weld length".

I would like to add the importance of weld sequence; if the stitches are laid down by back-stepping, there is normally less material distorsion, than if you work in one direction. That goes for the "continous" (only Machines can make it continous!) weld as well. Also, if the material thickness only requires a single weld pass for tighness and/or strength, it is important to fix the edges by tack welds, again with a separation distance around 75 mm, depending on thickness and shape.

That makes sense. You weld 75 mm, leave a space 75mm, weld 75mm again etc until done. Then grind etc, go back and fill in the 75mm spaces, then grind etc, then continuous weld the whole works. I imagine the sequence would apply to any stitch welds, whether chain, staggered, butt, lap, filet or any other type there might be that need to end up being a continuous/tight weld.

Thank you, today I learned something.

As an example that even to knowledgeable people instructions aren't always clear...


https://app.aws.org/forum/topic_show.pl?tid=12143

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[SamSam]

In return, I would like people who do not know or know little about welding, stop talking on welding, or at least stop saying generalities that are not true, in general.

And, as a friend of mine says, "if you're not able to understand it, better do not comment anything".

I guess you're talking about me. A friend of mine, when loudly told by the foreman to quit asking so many God damn questions replied even louder "Hey, that's how I ******* learn!" 40 years later I still laugh about that.

 

[TANSL]

SamSam, no, I was not talking about you, but I can consider you as a friend. Actually, maybe I have not expressed well. The problem is not asking questions, which is very healthy, but talking about what one does not know.