When welding 3/8 inch steel using short circuit with a gas mixture of 75% argon and 25% CO2, what is the suggested voltage?

When welding 3/8 inch steel using a short circuit transfer method with a gas mixture of 75% argon and 25% CO2, the suggested voltage range is typically around 23 to 24 volts. This voltage range is effective for maintaining a stable arc while ensuring the heat input is appropriate for penetrating the material without excessive burn-through or distortion.

Achieving the right voltage is essential for short circuit MIG welding because it affects the arc stability and the weld pool's characteristics. A voltage that is too low may lead to an unstable arc and insufficient penetration, while a voltage that is too high may cause excessive spatter and larger weld bead sizes. The 23 to 24 volt range helps to create the right balance of heat and control, allowing for optimal welding performance on thicker materials like 3/8 inch steel.

In addition, the gas mixture of 75% argon and 25% CO2 provides a good combination of weld bead appearance and mechanical properties, making it a popular choice for MIG welding applications involving carbon steels. The use of this specific voltage with this gas mixture ensures better wetting of the weld pool and minimizes the occurrence of defects.