09 establishing the arc and making weld beads, 10 pre-weld procedure, 11 welding procedure – Tweco FP-165 Mini MIG User Manual

Page 39: Establishing the arc and making weld beads -8, Pre-weld procedure -8, Welding procedure -8

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FIREpOwER Fp-125, 135, 165


Manual 0-5123



4.09 Establishing the Arc and Making

Weld Beads

Before attempting to weld on a finished piece of work, it

is recommended that practice welds be made on a sample

metal of the same material as that of the finished piece.
The easiest MIG welding procedure for the beginner to

experiment with, is the flat position. This equipment is

capable of flat, vertical and overhead positions.
For practicing MIG welding, secure some pieces of 16 or

18 gauge (0.06” 1.5mm or 0.08” 2.0mm) mild steel plate

6” x 6” (150 x 150mm). Use 0.024” (0.6mm) wire and

75% Argon / 25% CO2 shielding gas.

4.10 Pre-Weld Procedure

1. Check the OPERATION chapter of this manual for

details on this equipment.

2. Set the welding voltage range switch at position

1 or 2.

3. Set the wire feed speed control to about the 2.5

setting. Readjust as necessary.

4. Adjust the gas flow rate to about 20 cubic feet per

hour (15 - 20 lpm).

5. Review standard safe practice procedures in ven-

tilation, eye and face protection, fire, compressed

gas and preventative maintenance. See Safety

Instructions and Warnings chapter included in

this manual.

4.11 Welding Procedure

1. Maintain the tip to work distance (stickout) at 5/16”

to 3/8” (8 to 9mm) at all times.

2. For transverse and longitudinal nozzle angles, see

section 4.07 Welding Gun Positions.

3. Hold the gun about 3/8” (9mm) from the work,

lower the helmet by shaking your head and

squeeze the trigger to start the wire feeding, and

establish the arc.


Get in the habit of shaking the helmet down, rather than

using the hands. One hand must hold the gun, and the

other is often needed to hold pieces to be tacked or


4. Make a single down-hand (pulling) stringer weld


5. Practice welding beads. Start at one edge and weld

across the plate to the opposite edge.


When the equipment is properly adjusted, a rapidly

cracking or hissing sound of the arc is a good indicator

of correct arc length.

6. Practice stopping in the middle of the plate, restart-

ing into the existing weld crater and continuing

the weld bead across the plate.


When the gun trigger is released after welding, the

electrode forms a ball on the end. To the new operator,

this may present a problem in obtaining the penetration

needed at the start of the next weld. This can be corrected

by cutting the ball off with wire cutters.

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