Top tips Nick. This should be in the wikifootstuck wrote:Just a thought, but you Must use loads of CO2 when welding a tube.
The oxygen contained within the hollow section will or may burn the weld internaly.
So, fill it with CO2 before blinding it with the filling bolt.
Also, I would only make one initial pass around the joint and pick up both pieces with
the weld. Once sealed you should have no more oxy ingress from behind the weld.
Plus, because of the heat and contour of tube,
the CO2 falls away from the top of the weld,
which is where you need it most. So you may have burnt the joint during welding.
Using MAX CO2 for such a small weld costa nufing, so keep the trigger
half pulled so you keep protecting the weld untill you are sure it is cooled below combustable temp.
Peasant - let us know how long it lasts, if it ever fails!