Cooling welded connection

[Willl]

critical application.

Just what in this forum fits in that category ?

 

[BobRip]

Just what in this forum fits in that category ?

I suspect that some people are talking about quenching red hot metal and others black hot. There is a lot of difference in how this affects.

 

[JB4310]

Just what in this forum fits in that category ?

Anything that if it comes undone someone could get hurt.

And many FARM IMPLIMENTS do fit that category for sure, IMO

JB.

 

[Willl]

I suspect that some people are talking about quenching red hot metal and others black hot. There is a lot of difference in how this affects.

Agreed, and that's alot of my point.

By the time you get ground disconnected and the piece brought to water, 'red/orange' is gone.

Remember, we're talking 'backyard/garage' stuff here.

 

[JB4310]

I was gonna say I've never done it in all the years I've been welding, but I must have cause I know exactly what it sounds like.

That sound kinda tells you it's not real happy

Just cause somethings made/repaired in a back yard or garage, doesn't make it less critical.

JB.

 

[killdozerd11]

You have been lucky.

Rapidly cooling a weld is a bad idea
it causes differential stress in the metal in the weld and the surrounding metal
in the HEZ =Heat Effected Zone

Some metal will become hard a become like glass ...snap...that's a bad thing

Some metals like cast iron need pre and post heat treatment so it expands and contracts evenly otherwise it will distort or i have had it crack while it was just air cooling but it all depends on the base metal you are working with

As a rule of thumb don't do it

 

[gerard]

Rapidly cooling a weld is a bad idea
it causes differential stress in the metal in the weld and the surrounding metal
in the HEZ =Heat Effected Zone

Some metal will become hard a become like glass ...snap...that's a bad thing

Some metals like cast iron need pre and post heat treatment so it expands and contracts evenly otherwise it will distort or i have had it crack while it was just air cooling but it all depends on the base metal you are working with

As a rule of thumb don't do it

Cast iron is not even a question. Don't do it. Welding cast the metal should be uniformly preheated first, then allowed to cool S L O W L Y. Many people will keep hitting it with a torch to slow the cool, or bury it in hot sand. mild steel is more forgiving of quenching but cast iron is NOT friendly to quick cooling.

 

[whistlepig]

Cast iron is a different beast altogether. Rare is a welder these days that knows how to braise or NiRod cast iron. Cast iron is becoming a thing of the past.

 

[Willl]

My last post on this one, and disregard if your working for NASA or 3RR.

If your welding old bed frame together or repairing a 3pt implement or equivalent and it's too hot to handle after welding, don't worry about blasting it with the hose.

It won't change a thing.

 

[Sandlot]

Well then, I guess that's the final word!