Weld Question

[Dirty Frank]

I have a Weld Question. Realize when it comes to welding I am a complete novice and would appreciate small words in the answer.

If Two pieces of steal are welded together and pressure is applied, is the weakest point the welds or are the welds of the same integrity of the steal?

If the weld breaks does this indicate a poor weld?

 

[864runner]

Yes if the weld breaks that indicates a poor weld. And the weld should be stronger then the steel around it so the steel around the weld should break before the actual weld does.

 

[Dirty Frank]

Thanks for the response. That's what I was hoping.

 

[Hunt]

This is only mostly true.

The welded joint should be as strong if not stronger than the base material. BUT just because a weld fails does not mean that it was a poor weld.

Poor joint design(butt, lap, tee, etc.)
Poor fit up(over or undersized gaps)
Improper application of a joint(using a butt where you should have used a lap)
Undersized weld(not enough weld laid down to equal the strength of the material being welded)
Poor weld technique(the operator just can't weld)
Improper materials utilized(wrong gas, wrong rod/electrode, non compatible consumables)

And many other things lead to a "Poor weld".

If a weld fails don't assume the person that welded it did a poor job. It might very well have been the engineering/design that is in question or in play. In a lot of the case scenarios I run into the weld is specifically designed to fail before the structural members. So that in the event of a catastrophic event the structure reacts in a predictable manner.

 

[864runner]

This is only mostly true.

The welded joint should be as strong if not stronger than the base material. BUT just because a weld fails does not mean that it was a poor weld.

Poor joint design(butt, lap, tee, etc.)
Poor fit up(over or undersized gaps)
Improper application of a joint(using a butt where you should have used a lap)
Undersized weld(not enough weld laid down to equal the strength of the material being welded)
Poor weld technique(the operator just can't weld)
Improper materials utilized(wrong gas, wrong rod/electrode, non compatible consumables)

And many other things lead to a "Poor weld".

If a weld fails don't assume the person that welded it did a poor job. It might very well have been the engineering/design that is in question or in play. In a lot of the case scenarios I run into the weld is specifically designed to fail before the structural members. So that in the event of a catastrophic event the structure reacts in a predictable manner.

Yeah what he said.