Question

How can undercutting be prevented on an inside corner joint that is welded in the horizontal welding position?

1) By using a smaller electrode size
2) By increasing the welding current
3) By decreasing the welding speed
4) By using a larger electrode size

Answer 1

Undercutting can be prevented by using a smaller electrode size and decreasing the welding speed, which allow for more precise control over the weld pool and reduce the risk of excessive heat input.

Step-by-step explanation:

To prevent undercutting on an inside corner joint that is welded in the horizontal welding position, there are certain techniques to consider. Undercutting is an unwelcome groove that appears at the toe of the weld, which can weaken the weld and lead to various issues such as stress concentration and crack initiation. To prevent it, one can:

• Use a smaller electrode size to reduce the heat input and better control the weld pool.
• Decrease the welding speed to allow for a more controlled deposit of the welding material.

Options such as increasing the welding current or using a larger electrode size are more likely to exacerbate undercutting by increasing the heat input and fluidity of the weld pool, making it difficult to control, especially on inside corner joints in a horizontal welding position.