Arc Machines 307 - Manual (Page 160)

Arc Machines, Inc. Model 307 Orbital Tube Welder Training
Document No. 740096 Chapter 16. Page 7.
Rev. A
Use Adequate Ventilation. Welding should be done with good ventilation
to avoid breathing harmful materials that may be produced during welding.
Gas hose connections to the purge plugs must be leak-free.
Use the chart on page 8 to determine the flow rate and minimum purge times
required for the weld head being used.
Coupon welds should be made with the same shield and purge gas as the pro-
duction welds.
Welding tubing in a clean-
room with a Model 9-500.