attach to the cylinder & then Pre-heat around the area you want to weld. By using a whole new electrode, make a continuous weld completely around the pipe if possible.
For the best results grind the attaching pipe to the same shape as the cylinder on the end & that way you shouldn't have any spaces you have to fill up
Whether you arc weld the joint or mig weld it doesn't make much difference other than you don't have to stop & remove the slag or flux left behind from an arc welder. A mig welder you don't have these problems, so can make a continuous joint, without leaving any pin holes, that an arc welder would leave.
Let the materials cool down on their own & don't quench the joint with water other wise the joint my break & crack!
Cheers!!
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