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12 inch pipe with 35 degree bevel.
Open root welded with 5/32" XX10 electrodes
fill and cap with 3/16"
Downhill root with XX10 rods are very common in the oil and gas industry.
A very valuable high paying skill is to be able to make good roots like this.
In pipeliner terms, its called "the bead"
This Video shows settings and techniques that would be used for a branch connection test. Yes its a practice plate but the welding techniques apply
6G 6 inch schedule 80 pipe test with 6010 uphill root.
arc shots, rod angle, body positioning are all key factors