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For professionals or DIY welders who are commonly welding thicker metals, an arc welder such as the SCA 100AMP ARC Welder may be just the right tool. This welder can weld between 2-4mm thick and can be adjusted via the variable amperage setting. An Arc welder uses a fixed electrode rod which is covered in flux, thus creating a shield from impurities caused by regular atmosphere when welding. This can make an arc welder much more suitable for outdoor work than a typical gasless Mig.