can you mig weld DOM tube........

[2badfjs]

or do you have to tig it???

 

[woody]

My cage is Mig'd...and well tested....go for it!

 

[2badfjs]

grassyass

again woody

 

[Texican]

your thinkin' chrome moly which has to be TIG'd
Butch

 

[flintknapper]

DOM will "mig" just fine. "tig" will make a stronger weld, but may not be necessary for your application. If a "roll cage" is what you have in mind be sure to "gusset" it generously....and you'll be O.K.

 

[2badfjs]

thank you all

very much

 

[mattg]

DOM will "mig" just fine. "tig" will make a stronger weld, but may not be necessary for your application.

why?

So long as both have proper penetration wouldn't their strength be equal? Wouldn't the advantages of TIG simply be heat control and visual appearance? I would think an experienced weldor (i.e. not me ) could create an equally strong MIG weld.

Not trying to argue, just interested in more details.

 

[flintknapper]

why?

So long as both have proper penetration wouldn't their strength be equal? Wouldn't the advantages of TIG simply be heat control and visual appearance? I would think an experienced weldor (i.e. not me ) could create an equally strong MIG weld.

Not trying to argue, just interested in more details.

Google "TIG & "MIG" for your answer.

 

[poldo]

why?

So long as both have proper penetration wouldn't their strength be equal? Wouldn't the advantages of TIG simply be heat control and visual appearance? I would think an experienced weldor (i.e. not me ) could create an equally strong MIG weld.

Not trying to argue, just interested in more details.

Tig is always stronger but this doesn't mean MIG isn't strong enough...yes you can MIG weld DOM tubing , Ducati and other high end Bike manufacturers
use MIG on some frames and TIG on others mostly for appearance reasons ..

 

[Mike S]

Jim, I can't MIG weld DOM tubing - or much of anything, in fact. You probably can, tho.'

M

 

[2badfjs]

thanx mike

Jim, I can't MIG weld DOM tubing - or much of anything, in fact. You probably can, tho.'

M

i always thought DOM was a tig only thing,but in fact i was getting crome moly mixed up with DOM.

thanx all!!!!

 

[71-CRUISER]

Wht cant you MIG Cromoly?

 

[2badfjs]

???????????????????

Wht cant you MIG Cromoly?

thats just what i've heard

 

[honk]

Tig done right is much less likely to result in a contamination of the joint welded. It's cleaner in other words.

I'm not positive about this but I think the reason for the chrome-moly restriction comes from the requirements of some racing association's equipment rules specifying chrome moly tubing Tig welded for roll cages as well as tubular chassis. You CAN make chrome moly stick together using Mig, stick, or even carbon arc as far as I know, but they may not give you a strong part.

 

[Planet_X]

4130 can me migged just fine and doubt heat treat will be an issue due to material thickness (thinness).

good ole e70s-3 or e80s-2 for more strength

whats the e70s-3 good for 70,000 lbs yeild ? Any welding process is going to weaken the parent metals, destructive testing is about the only way to ensure your weld procedures are the right ones.

Tigs cool and all , but it is not inherently superior to any other welding process, just another option.

Some of these 'rules' are brought over as Honk stated from racing affiliations and their rules...this tig vs. mig thing comes up alot. But something not mentioned much is their restrictions on the NUMBER of bends on any given tube...

Different environments differing requirements for what is good enough I guess

 

[flintknapper]

4130 can be sucessfully Migged or Tigged as has been mentioned. In fact (if you know what you're doing) you can O/A with an E70S-6, but most people cant get the flame right.

For anything critical (racing cages) I would "Tig" because it allows the best control of heat, penetration, less contamination, changes physical properties of the parent metal less.

4130 can be migged well enough also, but the chance of building up material without deep penetration is greater. This is where the skill of welder comes into play.

Either way if you Mig or Tig....make sure your material is very, very, clean.

 

[Planet_X]

4130 can be migged well enough also, but the chance of building up material without deep penetration is greater. This is where the skill of welder comes into play.


I sniped your quote flintknapper.

When one is welding on stuff .120 wall and thinner, and the biggest reason to use 4130 is to go thinner wall to save weight yet retain strength, lack of penetration wont be the issue. Melt through will be.

 

[flintknapper]

4130 can be migged well enough also, but the chance of building up material without deep penetration is greater. This is where the skill of welder comes into play.


I sniped your quote flintknapper.

When one is welding on stuff .120 wall and thinner, and the biggest reason to use 4130 is to go thinner wall to save weight yet retain strength, lack of penetration wont be the issue. Melt through will be.

A good argument for "Tig" here. Overpentration (melt through) is not desireable either. With "Tig" you can back off on your foot pedal or hand control. Mig...you'd have to back down on amperage, or ...(hit it, let cool a second, hit it, let cool......) not ideal.

Proper fittment of joints is critical as well....especially "saddles".