Would you weld a petrol tank?

[Alexdaredevils]

Spangles said:

I've heard it done with exhaust fumes being blown through the tank. And it wasn't from the next of kin.

That's how my alloy fuel tank was done using a long pipe from a tractor exhaust

[S0 What]

Welded a few, i just steam clean them then fill them with CO2 from either a pub bottle, fire ex or in my case a paintball cylinder

[anonymous-user]

itiejim said:

The advice I have previously taken and used to successfully cut and mig weld a fuel tank was to wash it out with water then to completely purge it with exhaust fumes. Let the exhaust fill the tank for 10 minutes or so before starting and keep it going as you work on it.
Please do your own research on this and risk assess carefully before you attempt (or even decide) to do it as the consequences of getting it wrong could result in having much more time at home looking at PH (or never looking at it again)...

er, assuming you are using a MIG or TIG welder to weld the tank, then why use exhaust fumes when you have a nice big tank of easily and safely accessible inert gas strapped to the side of your welder?????

[Tango13]

Max_Torque said:

er, assuming you are using a MIG or TIG welder to weld the tank, then why use exhaust fumes when you have a nice big tank of easily and safely accessible inert gas strapped to the side of your welder?????

Because the exhaust fumes will be cheaper than using the inert welding gas which would probably run out halfway through the job 'cos most of it got used to purge the petrol tank...