Welding G60 displacer...

[aquablueg60 0]

Hi there,

 

I have just been having a play with a very wrecked G60 displacer, my tig welder and some rather special rods.......

 

Was just wondering if anyone else has had any experience welding them?

 

Does anyone have any spare displacers which are just missing bits of the apex seal groove which they would like to give/sell to me for little money for experimentation purposes :D

P.M me if you have :)

 

Any comments appreciated.... even the long stream of ones which are gonna tell me it can't be done....you'll warp the displacer.... you'll effect the heat treatment of the scroll....etc etc etc.

 

Cheers

[W3RKD 0]

What gas are you using

[aquablueg60 0]

Got a couple of different gases, argon and an argon helium mix. Not decided which is best yet

[coolrado 0]

go for the helium mix.

 

i know feck all about welding, but sounding like mickey mouse while your welding has to be a bonus :lol:

[PhatVR6 0]

errr, isn't the scroll made of magnesium? in which case, be VERY careful when welding it!

 

I have a spare scroll that need some work of you're brave enough.

 

I set fire to a tiny peice of apex that had snapped off......when it lit it burned so bright I couldn't even look at it, and it scorched the concete floor int he garage!

[aquablueg60 0]

Yes, its a magnesium alloy so its not quite as combustable as the little bits of magnesium you used to burn in science class but it will still burn all the same. The whole point of using a gas when mig or tig welding is to provide an inert shield around the weld pool to prevent the metal from oxidising.

Welding magnesium is no different to any other metal really. If you weld steel or ally without a shield gas it will turn to a pile of c*ap. Hence, as long as you have the correct gas shield, the correct flow rate and adaquate pre and post gas flow to create a complete shield there are no issues with welding it.

[W3RKD 0]

i have the exact material spec and it throws some intresting theory's on welding it up on the eng-tips forum we came to the conclusion that you need a helishield with 0% oxygen and some special rods which i will look up as i cant remember.

[CaiosG60 PWR 0]

Try these forums out for advice

 

http://www.mig-welding.co.uk/

 

and

 

http://www.ukwelder.com/forum/

 

Let me know how you get on, I''ve got a MIG welder and a couple of knackered chargers to practice on. I could maybe use some sort of alloy wire and a higher argon mix, but TIG would be better though.

 

EDIT* What TIG have you got?

[aquablueg60 0]

I have a fairly small AC/DC tig welder.

You wont have much luck trying to Mig weld a displacer. The choice of wire for a mig is very limited and all mig welders that i know of work on a DC only current. You need to be able to use an AC current for welding most aluminium and magnesium alloys as the change in polarity of the welding current has a cleaning action which prevents the weld pool oxidising and scavenges the impurities.

 

When tig welding the magnesium you need to use a "like" filler material. I did have a quick go adding an aluminium based filler and although it looked as though it took ok it was easy broken away again with a pair of pliers!