Techalloy 55 MIG

Techalloy 55 is used for TIG and MIG welding of cast iron. This filler metal is extensively employed to overlay cast iron rolls. It is also used to repair castings. The weld metal of Techalloy 55 is harder than that of Techalloy 99. However, the machining can be accomplished by using carbide tipped tools. A pre-heat and interpass temperature of 350°F (175°C) minimum is recommended during welding, without which the weld and heat affected zones could develop cracks.

http://proweldwelding.com.au/resources/images/M55.pdf