Doc No. 740123
8
MODEL 8 SERIES WELD HEAD
OPERATION MANUAL
6.0 CLAMP INSERT & GAS SEAL INSTALLATION
(Contd.)
6.2 Some fittings and components do not have enough straight/round
surface for the weld head to grip with a clamp insert. However, orbital
welding is still sometimes practical by manual tack welding the two
components together first, and mounting a gas seal on the side of the
weld head where this fitting is to be positioned.
The hole in the gas seal is designed to be approximately 1/8” (3mm)
larger than the diameter of the fitting being welded, to allow shielding
gas to escape. Before welding, the gas seal must be positioned
around the fitting so the (1/16”) gap between the gas seal and the
fitting is somewhat uniform. See fig. 6
Fig. 6
