thumb is to use 1 amp of welding
current for every thousandth of an inch
of material thickness to prevent too
much heat input.
TIPS AND TECHNIQUES FOR
MASTERING CUP WALKING
Before welding, align the pieces of tube or
pipe and tack them together with four to
six 1-in.-long tacks (depending on the size
of the tube or pipe) to prevent the pieces
from shifting during welding. Grind the
tacks to a feathered edge to ensure solid tie-in when welding the root pass. For the root
pass, select a No. 6 nozzle, which is suitable for most material thicknesses.
Rest the nozzle on the tube or pipe,
laying the filler rod in the groove, and
begin welding. Angle the torch so that
the back of the nozzle touches the tube
or pipe, keeping the tungsten slightly
above the surface of the groove. Rest
the nozzle in the groove, making contact on both sides of it, and move the
torch back and forth slowly in a zigzag
motion. Generate this motion by swaying the arm, not the wrist, to reduce
fatigue and steady the weld. Hold the
torch securely, but don’t squeeze it too
tightly, because doing so can cause
fatigue. The motion should be smooth
While welding, pull the weld puddle
to the high side of the joint to accommodate any out-of-roundness and to
avoid excessive root reinforcement.
Move from the bottom ( 6 o’clock) to
the top ( 12 o’clock) of the tube or pipe,
keeping the filler rod at the leading edge
of the weld puddle.
For subsequent weld passes, switch
to a No. 7 cup to fill the joint and a No.
8 for the cap pass. Larger nozzles allow
for a wider range of motion so it is easier to catch the edges of the weld joint
during fill and cap passes. Maintain
slight pressure on the filler rod during
each pass, and keep it tangent to the
Tube and Pipe End Forming
;;High-pressure systems and tools to quickly and
accurately expand, reduce, bead, and flare tube ends
;;Performs operation in 2 to 5 second cycles
;;Standard sizes : 0.13 in. to 6.00 in.
( 3. 2 mm to 152.4 mm)
;;Portable or stationary
hydraulic systems use
or modular tooling
;;Quick size change
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