Miller Axcess 675 Instrukcja obsługi - Strona 25

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Welding on a single workpiece using multiple welding power sources can cause arc blow and arc impedance to develop or intensify.

5-4. Using Multiple Welding Power Sources

Current Flow Path

Gun

Travel

Each welding power source should

have a separate work cable connection

to the workpiece. Do not stack or join

work cables together at the workpiece.

This is very important for pulse welding

applications.

It is important to connect the voltage

sensing lead as near to the weld as

possible, but not in the return current

path.

Connect voltage sensing lead at the end

of the weld joint.

The direction of the welding path should

connections.

Connect work clamp at the beginning of

the weld joint.

Each welding gun should have its own

source of shielding gas. Use a separate

shielding gas regulator and shielding

gas connection for each welding gun.

Arc blow is the deflection of a welding

arc from its normal path due to magnetic

forces. It will adversely affect the

appearance of a weld, cause excessive

spatter, and impair the quality of a weld.

Arc blow occurs primarily during the

welding of steel or ferromagnetic

metals. Weld current will take the path of

least resistance, but not always the

most direct path through the workpiece

to the work lead connection. The most

intense magnet force will be around the

arc due to a difference in resistance for

the magnetic path in the base metal.

The work clamp connection is important

and should be placed at the starting

point of a weld. It is recommended to

have as short of an arc as possible so

that there is less of an arc for the

magnetic forces to control. Conditions

affecting the magnetic force acting on

the arc vary so widely that the reference

here is only about cabling connections

and arc preferences.

Welding Power Source

Electrode Cable

Feeder Cable

Work Cable

Voltage Sensing Lead

Wire Feeder

Workpiece

away

from

the

work

cable

Ref. 804 638-A

OM-217 751 Page 21