Arc welding Stainless Steel

13th August 2024

Arc welding, or stick welding, offers versatility and portability for stainless steel applications. Its suitability for outdoor and remote locations makes it a valuable process for various industries. It is very useful for repair work, and for construction.

MMA (Manual Metal Arc) welding, also known as Shielded Metal Arc Welding (SMAW), is a type of welding process where an electric arc is generated between a consumable electrode and the workpiece. MMA welding is easier than MIG and TIG welding and requires less equipment.

What equipment do it need for MMA/ARC Welding Stainless Steel?

For MMA welding stainless steel you will need a MMA/Arc welding machine which usually comes with an electrode holder. Make sure you have the right settings such as the amperage and polarity on your mma welding machine for stainless steel. For most stainless steel, DC-positive polarity is used as it offers more focused heat at the arc and deeper penetration into thicker material. The right settings will depend on the chosen electrode and the thickness of stainless steel being welded.

The other factor to consider will be the welding electrode. For MMA welding stainless steel you must choose the right welding electrode that matches the grade of the stainless steel being welded. Electrode holder will hold the welding electrode in place and allow the welding current to flow through it.

How to MMA Weld Stainless Steel?

MMA welding stainless steel process will involve striking an arc with your electrode holder and the workpiece. Once the arc has been established, then move the electrode steadily along the joint line while simultaneously pressing down on the electrode holder. Make sure you maintain a consistent arc length during welding, usually around 2-4mm. It is also important to control the welding speed as stainless steel has a lower thermal conductivity compared to carbon steel so it requires slower welding speeds to avoid overheating and distortion.

Unlike MIG and TIG welding, MMA welding stainless steel does not require an external shielding gas. In MMA welding the flux coating on the electrode generates a protective gas shield when it melts during the welding process. This shield covers the weld pool, protecting it from the surrounding atmosphere, preventing oxidation and contamination.

Safety Precautions for Stainless Steel Arc Welding

Arc welding presents potential electric shock hazards, so ensuring proper grounding and insulation is essential. Always use the correct electrode type for the specific stainless steel grade being welded. Wear appropriate PPE, including a welding helmet, flame-resistant clothing, and gloves. Be aware of potential fire hazards and have a fire extinguisher readily available.