Arc Welding Accessories Supplies Technical Details
Arc Welding Consumables
Consumables are the materials consumed during the welding process, directly contributing to the weld joint. The primary types include electrodes, filler wires, and shielding gases.
Electrodes for SMAW
Shielded Metal Arc Welding SMAW electrodes are coated metal rods available in various classifications such as E6010 E6011 E6013 E7018 and E7024. Each classification denotes specific mechanical properties and welding characteristics. For instance, E6010 and E6011 are deep penetrating electrodes ideal for mild steel in all positions, offering good slag removal. E7018 is a low hydrogen electrode, excellent for high strength steels and critical applications due to its reduced risk of hydrogen-induced cracking, requiring careful storage to prevent moisture absorption. Electrode diameter selection depends on material thickness and desired penetration.
Filler Wires for GMAW GTAW FCAW
Gas Metal Arc Welding GMAW and Flux Cored Arc Welding FCAW utilize continuously fed filler wires. GMAW wires like ER70S-6 are commonly used for mild steel, offering good deoxidizer content for welding over light rust or mill scale. Stainless steel wires such as ER308L and ER316L are selected based on the specific stainless alloy. Aluminum wires like ER4043 and ER5356 are chosen for their silicon or magnesium content respectively, influencing strength and crack resistance. FCAW wires can be self-shielded no external gas or gas-shielded, with internal flux producing slag for protection and deoxidation. Gas Tungsten Arc Welding GTAW uses non-consumable tungsten electrodes which require specific types like pure tungsten thoriated lanthanated or ceriated for different current types AC or DC and base metals. Filler rods for GTAW are selected separately based on the base material.
Shielding Gases
Shielding gases protect the molten weld pool from atmospheric contamination oxygen nitrogen and hydrogen. Common GMAW gases include 100% CO2 which provides deep penetration but more spatter, and Argon CO2 mixtures typically 75% Argon 25% CO2 for general purpose welding on mild steel offering a smoother arc and less spatter. For stainless steel, Argon with a small percentage of O2 or CO2 is used. For aluminum, 100% Argon is standard. GTAW typically uses 100% Argon for most applications, though Helium or Argon Helium mixtures can be used for thicker materials or higher heat input.
Personal Protective Equipment PPE
Welding PPE is crucial for safety. Welding helmets with auto-darkening lenses protect against intense UV/IR radiation and arc flash, with shade levels adjustable to welding current. Welding gloves made of leather or heat-resistant synthetics protect hands from heat sparks and spatter. Flame-resistant jackets aprons and sleeves protect the body. Respirators or fume extractors are necessary when welding in confined spaces or with materials that produce hazardous fumes.
Welding Torches Guns and Holders
GMAW guns deliver the welding wire and shielding gas, requiring compatible nozzles contact tips and diffusers. GTAW torches range in size and cooling method air cooled or water cooled and house the tungsten electrode and gas lens. SMAW electrode holders securely grip the electrode and conduct welding current. Ground clamps establish a stable electrical connection to the workpiece, ensuring a complete circuit and preventing arc wander. Quality ground clamps are essential for consistent arc performance.
Cable and Workholding Equipment
Welding cables carry the current from the power source to the electrode holder and ground clamp. Their gauge must be appropriate for the current amperage and cable length to prevent overheating and voltage drop. Workholding devices such as welding clamps C-clamps locking pliers and magnetic holders secure the workpiece for stable and accurate welding. Welding positioners and rotators provide precise control over workpiece orientation, improving access and weld quality especially for repetitive tasks or large components.