Welding Strength

[renewablejohn]

Thanks for all the replies and I do appreciate it is a skill but surely it should be down to the engineering company to maintain the quality standard. Do you think it would be worth complaining to the MD of the company or is it just my bad luck as many people on the forum sing there praises but then generally it is for new equipment which is always easier to weld.

[IVECOKID]

Thanks for all the replies and I do appreciate it is a skill but surely it should be down to the engineering company to maintain the quality standard. Do you think it would be worth complaining to the MD of the company or is it just my bad luck as many people on the forum sing there praises but then generally it is for new equipment which is always easier to weld.

 

Problems is this is a Brutal industry we are in so even new Tackle is being pushed and tested to it limits at time .

 

Obviously there is a weak point that needs

Addressing with them next time it breaks .

 

 

Ste

[renewablejohn]

Problems is this is a Brutal industry we are in so even new Tackle is being pushed and tested to it limits at time .

 

Obviously there is a weak point that needs

Addressing with them next time it breaks .

 

 

Ste

 

Dread to think what would happen if forwarding trailer hit the deck at 20mph as all pipework and valve block would still be attached to the tractor.

[wisecobandit]

Weld is normally stronger than the material what is actually being welded.

 

However that is when welded properly. Sounds more like there hasn't been good penetration on the weld by what you said in your initial post.

 

Mig is fine upto about 5mm material. Thicker than that normally comes into the arc category.

 

If bits have broken off you should be able to visually inspect the weld and its normally pretty obvious if the weld hasn't penetrated well.

[Breezeblock]

we hardly ever use arc welding now for plant repairs as its too slow and not any better than mig we have used it on everything from tin work up to 4" thick jaws

[Peter]

The only real advantages to manual metal arc is changing filler material is easy, and you can use it outdoors without worrying about a shielding gas shroud getting blown away.

 

Other than that mig/mag and mma are very similar processes. Both use an electrical arc to form a weld pool, both shielded in one form or other.

 

It is perfectly possible to produce a joint with good fusion in any process, but it does take a bit more work in the prep, machine setup, and on thicker material preheating and controlled cooling may be needed.

 

I tend to use tig on the thin sheet and ally, and mig on thicker material. Do have arc function on the tig but never use it.

[cornish wood burner]

I have always worked on a design strength of 5 tons/ sq inch for normal welding. Exceed this figure at your peril.

There are high strength rods which should be used if required but much more expensive.

[renewablejohn]

Would it be possible that the heat of the weld has weakened the jaw as the jaw has broken directly above the weld.

[cornish wood burner]

Would it be possible that the heat of the weld has weakened the jaw as the jaw has broken directly above the weld.

If you are referring to a drawbar jaw then it will almost certainly be heat treated so very dangerous to weld this

Edited March 18, 2015 by cornish wood burner

[Peter]

Would it be possible that the heat of the weld has weakened the jaw as the jaw has broken directly above the weld.

 

 

The area adjacent to the weld is known as the heat affected zone. It is always weakened by the effects of heating and cooling post weld. A properly made weld will always be stronger than the heat affected zone.

 

 

It would be possible to weld a heat treated piece and then re heat treat it afterwards.