Jasic JT-300P, Operator'S Manual

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33
GUIDE TO MMA WELDING
Before starting any welding activity ensure that you have suitable eye protection and
protective clothing. Also take the necessary steps to protect any persons within the welding
area.
Fillet welding
The electrode should be positioned to split the angle i.e. 45º. Again the electrode should be inclined in the
direction of travel at around 10º
- 30º.
Manipulation of electrode
In MMA welding there are three
motions used at the end of electrode:
1. The electrode feeding to the
molten pool along axis
2. The electrode swing right and left
3. The electrode moving in the weld
direction
The operator can choose the manipulation of electrode based on welding joint, welding position,
electrode spec, welding current and operation skill etc.
Weld characteristics
A good weld bead should exhibit the following characteristics:
1. Uniform weld bead
2. Good penetration into the base material
3. No overlap
4. Fine spatter level
A poor weld bead should exhibit the following characteristics:
1. Uneven and erratic bead
2. Poor penetration into the base material
3. Bad overlap
4. Excessive spatter levels
5. Weld crater