Climax AUTOBOREWELDER BW3000, Руководство по эксплуатации

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Page 56 BW3000 Operating Manual
4.8 W
ELDING TIPS
4.8.1 Achieving the smoothest and least violent arc action
The length of time the BoreWelder can be used continuously depends mostly on
spatter buildup in the welding nozzle. Therefore, a main objective when deciding
what kind of wire, gas, and power supply to use is to choose the combination that
produces the smoothest and least violent arc action. Such a combination typically
produces less spatter buildup and longer welding times.
Wires with higher deoxidizer contents usually work best. Wires ER-70S-6 and ER-
70S-2 work well. Any common inert gas can be used; but those with high argon
contents are preferred. A mixture of 92% argon/8% CO2 works well, as does 75%
argon/25% CO2. The former generally is preferred. Straight argon or helium
should not be used for steel, and straight CO2 produces excessive spatter.
T
IP
:
ER-70S-2 is probably the better choice for multilayer buildups because
it deposits less silicon dioxide.
4.8.2 Avoiding wire flip by using a wire with a large cast
The term “wire flip” is used to describe an inherent condition in borewelding. The
spindle and torch of the BoreWelder rotate around a nonrotating wire. Torque is
applied to the wire by the rotating torch, and is affected by a number of variables
including, but not limited to, extension lengths, stroke of machine, conduit length,
conduit shape and configuration, orientation of wirefeeder in relation to Bore-
Welder, and the cast of the wire.
As the BoreWelder turns, the wire is twisted slightly between the torch and the
wirefeeder. This twist (in extreme cases), unwinds once per revolution as the torch
progresses around the bore, and produces a change in the track of the weld in a
small area of the bore. In extreme cases, “flip” can cause a void in the weld. Typi-
cally, there are no detrimental effects to the finished product.
To avoid this problem, use a wire with a large arc or “cast.” Cast is the diameter of
the circle that a wire makes on the floor in its relaxed state.
To check cast, cut about 4 feet (1.2 meters) from your roll of wire and toss it on the
floor. The cast diameter should be as large as possible and at least 40" (1 meter).
Casts under 30" (0.8 meter) are likely to cause difficulties. A cast of 40" (1 meter)
or more will reduce or eliminate the effect of wire flip. Consult with CLIMAX if
you are unable to find large cast wires.