Effect of welding parameters on Submerged Arc Welding on weld shape and penetration.
- Welding Current
The welding current will affect The rate of adding metal (Deposition rate) and deep melting (Penetration) if the welding current is too high Will it result in the melting being too deep? The workpiece may be punctured.
and results in the wastage of welding wire (Electrode) and the convexity of the weld line. (Reinforcement) more than necessary and may also result in significant shrinkage of the weld line and may result in deformation.
Due to heat (Distortion). On the other hand, if the welding current is too low, it may result in melting. Incomplete melting (Incomplete Fusion) and may cause an unstable arc (Unstable Arc)
2. Welding Voltage
The voltage depends on the distance. The arc distance refers to the distance from the tip of the welding wire to the weld pool. If the pressure increases, it means that the arc distance increases. Most of the voltage
It will affect the cross section and external shape. The increase in voltage while current Constant fire causes the welding line to be wide and concave bead and increases flux usage as well.
It also increases the chance of porosity. In summary, excessive voltage will have the following effects:
– The line is wide and concave and may crack.
– Difficult to eliminate exchanges
– May cause pores
– Undercut may occur in fillet welding.
3. Travel Speed
If the welding speed increases Energy or heat entering the workpiece (Heat input) will be reduced and the welding wire consumption rate will be reduced. As a result, the convexity of the weld line is also reduced. So the shape
of the weld line is therefore relatively small. The effect of welding speed has a greater effect on deep melting. Other parameters and excessive speed may result in A cleft bite occurred. Arc deviation (Arc blow)
Pores and uneven bead shape
4. Electrode Size
The size of the weld wire influences the metal filling rate. The welding wire is relatively small. It has a high current density.
and a higher rate of metal addition Welding wire that is larger than However, a larger size will have a greater range of electrical current that can be used.
