Arc Machines 307 - Manual (Page 145)

Arc Machines, Inc. Model 307 Orbital Tube Welder Training
Document No. 740096 Chapter 14. Page 1.
Rev. A
C
hapter 14. End-Preparation for Orbital
Welding
P
roper and consistent end preparation is an essential requirement for
repeatable high-quality orbital welding results. The most commonly used end
preparation for orbital GTA fusion
welding is the Square Butt prepara-
tion in which the ends of the tubing
are faced square with no bevel so
that they mate together in the weld
head with no discernable gap.
The ASME Bioprocessing Equipment
Standard (BPE-2002) has defined
the acceptance criteria for ends of
fittings and weld components for
orbital welding in biopharmaceutical
applications.
Preparing tube ends in a cleanroom with a machine that cuts and faces in
one operation. Photo courtesy of Murray Company
Tube ends must be faced square without burrs
or breaks to fit up snugly in the weld head.