So if table 4.10 does not apply to tack welders, and taking 4.19.2.1 into consideration, would the tack welders be able to tack a CJP butt joint that is to be welded from one side
and backgouged and/or a backing weld on the back of the joint then filling the rest of the joint from the front?
I understand 4.19.2.1 if it pertains to open root CJP and T-,Y-,K-connections.