Magnatech LLC introduced the model M500 head for fusion welding tubes and fittings. The ultralow-profile head is for welding fittings and components with minimal straight extensions as short as 0.25 in. It covers sizes 0.125 in. to 0.500 in. using interchangeable, size-specific cartridge assemblies. Alternatively, cartridges using interchangeable collets (tube clamp inserts) provide size range capability with a single cartridge. The head is suitable for restricted-clearance microfitting welding applications in the aerospace, instrumentation and hygienic process industries.