The invention discloses an iron
casting digging-replacement
welding repair method. The method comprises the following steps that (1) a damaged part of an iron
casting is
cut off through
plasma cutting, and a replacement insert is manufactured through a steel plate according to the shape of the
cut part; (2) according to the thickness of the steel plate, a
cut iron
casting kerf and the edge of thereplacement insert are grooved and ground cleanly, and brand-new
base metal is exposed; and (3)
carbon dioxide arc welding machine is adopted, power source poles adopt the
direct current electrode positive mode,
molten pool protection gas is 100%
carbon dioxide, a
carbon dioxide flux-cored wire is adopted, carbon-dioxide
arc welding is conducted at the
room temperature, and the replacement insertis connected to the iron casting in an inserted mode. The method is simple in process, convenient to operate, easy in
welding and good in fusing performance, through the
repair method, the iron casting can be repeatedly used, resources are saved, the ship repair period is shortened, components scrapped due to
corrosion and rotting are reduced, cost of shipowners is reduced, and the ship repair cost is reduced.