Tweco 201 ts Thermal Arc User Manual

Page 42

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THERMAL ARC 161 STL, 201 TS

OPERATION

Operation

4-12

Manual 0-5203

C. Vertical Welds

1. Vertical Up
Tack weld a three feet length of angle iron to your

work bench in an upright position. Use a 1/8"

(3.2mm) E7014 electrode and set the current at

120 amps. Make yourself comfortable on a seat

in front of the job and strike the arc in the corner

of the fillet. The electrode needs to be about 10°

from the horizontal to enable a good bead to be

deposited. Refer Figure 4-19. Use a short arc, and

do not attempt to weave on the first run. When

the first run has been completed de-slag the weld

deposit and begin the second run at the bottom.

This time a slight weaving motion is necessary

to cover the first run and obtain good fusion at

the edges. At the completion of each side motion,

pause for a moment to allow weld metal to build

up at the edges, otherwise undercut will form and

too much metal will accumulate in the centre of the

weld. Figure 4-20 illustrates multi-run technique

and Figure 4-21 shows the effects of pausing at

the edge of weave and of weaving too rapidly.

Art # A-07701

Figure 4-19: Single run vertical fillet weld

Art # A-07702

Figure 4-20: Multi run vertical fillet weld

Art # A-07703

Figure 4-21: Examples of vertical fillet welds

2. Vertical Down
The E7014 electrode makes welding in this

position particularly easy. Use a 1/8" (3.2mm)

electrode at 120 amps. The tip of the electrode is

held in light contact with the work and the speed

of downward travel is regulated so that the tip of

the electrode just keeps ahead of the slag. The

electrode should point upwards at an angle of

about 45°.

3. Overhead Welds
Apart from the rather awkward position necessary,

overhead welding is not much more difficult that

downhand welding. Set up a specimen for over-

head welding by first tacking a length of angle

iron at right angles to another piece of angle iron

or a length of waste pipe. Then tack this to the

work bench or hold in a vice so that the specimen

is positioned in the overhead position as shown

in the sketch. The electrode is held at 45° to

the horizontal and tilted 10° in the line of travel

(Figure 4-22). The tip of the electrode may be

touched lightly on the metal, which helps to give a

steady run. A weave technique is not advisable for

overhead fillet welds. Use a 1/8" (3.2mm) E6012

electrode at 120 amps, and deposit the first run

by simply drawing the electrode along at a steady

rate. You will notice that the weld deposit is rather

convex, due to the effect of gravity before the

metal freezes.

Art # A-07704

Figure 4-22: Overhead fillet weld

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