Sealey inverters 230v with accessory kit sealey mw140a a 140a inverter from sealey with accessory kit lightweight powerful and incredibly versatile this inverter offers many advantages over traditional transformer type welders inverters use state of the art electronic components to produce fully portable power sources for arc welding for example mw140a will produce up to 140amps at 40 duty cycle manufactured from pressed steel with a powder coated finish for extra corrosion resistance