Introduction
Welding is the most commonly used method for joining two or more pieces together. One important factors to consider during welding is the behavior of the molten metal contained in the weld joint itself. It is important to understand the effects that shielding gas can have, on the weld joint, as this can have a significant effect on the final weld, depending on the type of material that is being welded.
Shielding gases are commonly used when welding with any type of arc welding process. Arc welding is a type of welding that produces heat through an electric arc. Shielding gases work to protect the weld pool from the atmosphere and to help prevent oxidation while welding. The gas used is normally both nitrogen and argon, and is referred to as an “argon/nitrogen mix”.
Effects of Shielding Gas
Shielding gases can have a number of different effects on the weld joint when used properly. The most important of these are:
1. Protection from oxidation
One of the main benefits of using a shielding gas is its ability to prevent oxygen from entering the weld pool. Oxygen can easily combine with the weld metals, forming oxides which can weaken the weld joint and decrease the strength of the final weld. The shielding gas acts as a barrier, preventing oxygen from entering the weld pool and reducing the amount of oxide formation.
2. Improved puddle control
The shielding gas can also help to control the weld puddle. The shielding gas works to stabilize the arc, creating a more consistent and controllable arc. This can help to produce a much more consistent puddle and evenly-shaped weld.
3. Better penetration
Shielding gas has also been shown to increase the depth of penetration of the weld. This can create a stronger weld joint, as the weld metal penetrates deeper into the base material, creating a stronger bond between the two.
4. Improved weld appearance
Shielding gas can also have an effect on the appearance of the weld. The gas can reduce the amount of spatter created during the welding process and can create a much smoother weld joint.
Conclusion
Shielding gas is an important factor to consider when welding with any arc welding process. The gas can help to protect the weld from oxidation, improve puddle control, increase the weld penetration and improve the overall appearance of the weld. It is important to use the correct shielding gas for each application to ensure the best possible results.
