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13
The Micro Welder Experts
it is recommended to blunt the electrode instead of sharpening it, as shown in Figure 12.3. A flat or
blunted electrode is ideal when using the Omega PAWH weld head.
• Follow the “When to Sharpen the Electrode” instructions on the previous page.
• Once the electrode is sharp and clean, turn the electrode to a 90-degree angle and push it against the
diamond disk in order to place a flat/blunt tip on the electrode. Cleaning the edge of a blunt tip elec
-
trode assists in preventing the electrode from sticking to the weld surface, especially when using the
PAWH weld head.
•
Once the electrode has a flat/blunt tip, turn off the rotary tool and insert the electrode back into the
stylus as explained earlier.
Shield Gas Setup
During the pulse-arc welding process high temperature plasma quickly melts metal into a molten pool. As the
weld is performed, a small amount of shielding gas is released through the weld stylus to prevent oxygen from
entering the molten pool. After the weld has occurred the protective gas turns off.
If oxygen from the air enters this molten pool, the result is a metal oxide that is brittle, porous, and burnt-looking.
Protective shielding gas is used, such as 99.996% pure argon (Argon 4.6), to prevent these effects.
PRESSURIZED GAS SAFETY
There are several important rules that should be followed when using a compressed shielding
gas such as argon:
Always secure the pressurized gas tank to a fixed location
(such as a sturdy table leg). If
the pressurized gas cylinder were to tip and become damaged there is possibility that the
tank could become a projectile, expelling the high-pressure shielding gas as propellant.
Always turn off the shielding gas at the main valve when finished.
This will help your shielding gas supply
last longer in case there is a small leak in the tubing. This is also a good safety practice. If the tube becomes
dislodged shielding gas could fill the room and displace oxygen, which can lead to suffocation. Argon is heavier
than air and will fill the room from the bottom upward. If you experience a large shielding gas leak, open all of the
doors and windows in the room.
SHIELDING GAS TANK AND REGULATOR SETUP
• Ensure that your shielding gas tank is securely fastened to a stationary point near the welding area.
• Turn the regulator dial COUNTERCLOCKWISE (closed) until it is fully backed out, meaning the dial
becomes loose, to prevent over-pressurization of the line.
• Screw the gas regulator onto the shielding gas tank and tighten fully using a wrench.
• If not already done, insert one end of the included ¼” OD gas tubing into the gas port on the back of the
power supply. Tug gently on the tube to verify a tight fit.
• Connect the other end of the gas tubing to the gas regulator.
• Open the gas tank at the main valve slowly. The dials attached to the regulator should respond as the
