A pneumatic fixture keeps the nipple in position without any need for stitching prior to automatic welding.
The machine setting and resetting for different jobs are extremely simple as CNC allows to record : cylinder, nipple diameters, welding speed, overlapping amplitude, delayed start, etc.
The machine body incorporates a sliding door both for load/unload facilities and for isolating the welding process protecting the operator from arc radiation and from hot sparks as well.

Elbow inlet automatically kept in vertical position without any need for stitching prior to automatic welding.