CN105772986A - Solid cored welding wire for cast iron weld repair - Google Patents

Abstract

The invention relates to a solid cored welding wire for cast iron weld repair. The solid cored welding wire is prepared from, by mass percent, 0.8%-1.6% of Al, 1.0%-1.6% of Ni, 0.3%-0.6% of Mn, 0.3%-0.5% of Si, 0.025%-0.1% of Re, smaller than 0.03% of C, smaller than 0.03% of S, smaller than 0.03% of P and the balance iron. The gas shield welding wire is excellent in welding performance, the hardness of a fusion zone can be remarkably reduced during cast iron weld repair, the elongation of the zone is improved, and the tendency of cold cracks is reduced.

Description

A kind of iron weld repair solid core welding wire

Present disclosure relates to a kind of welding wire for cast iron.

Background technology is in the soldering of ironcasting, and the gas shielded arc welding with H08Mn2Si or H08MnSiA filament as consumable electrode has wide application.This method welding current density is big compared with welding rod, and heat affected area is less, and hot cracking tendency is little, weldering speed is very fast, but its weld hardness is higher, and fusion area chill width is wider, high hard area occurs in melt run and the melt run position near mother metal, and hardness can be more than 300HBS, processing difficulties；It addition, easily there is cold crack in the region that weld edge is combined with mother metal.

The summary of the invention present invention promotes fusion area carbon graphitization with the metallurgical reaction of multiple element, reduces hardness, improves percentage elongation, reduces cold crack tendency.

The present invention is with pure iron as base material, with 0.3%-0.6% manganese 0.3%-0.5% silicon combined deoxidation；With 0.025%-0.1% rare earth deoxidization desulfuration, and form the heterogeneous nucleus of graphite, increase spherical graphite quantity, promote spheroidization of graphite；Promoting graphitization with 0.8%-1.6% aluminum and 1.0%-1.6% nickel, aluminum has preferable deoxidation and strongly promotees carbon graphitization, and nickel contributes to carbide and decomposes, and reduces chill width.By the associating metallurgical reaction of above-mentioned element, promote fusion area carbon graphitization, reduce chill width, fusion area hardness can be made to be reduced to below 250HBS, improve processing characteristics, also improve this district's percentage elongation simultaneously, reduce cold crack tendency；The phosphorus content of weld seam own is the lowest, is a kind of with ferrite as matrix, the tissue of other element solid solutions, and its hardness, is deformed when weld seam cooling meat up to 30 percent at 90HBS-170HBS, percentage elongation, thus reduces cold crack tendency.

After required each element is pressed corresponding proportion and order proportioning by the detailed description of the invention present invention, it is drawn into the filament of required size through vacuum melting rolling, with this filament as consumable electrode, uses the mode welding of gas shielded arc welding.

Claims (1)

1. the solid core welding wire for cast iron, it is characterised in that each element mass percent is: Al 0.8%-1.6%, Ni 1.0%-1.6%, Mn 0.3%-0.6%, Si 0.3%-0.5%, Re 0.025%-0.1%, C ＜ 0.03%, S ＜ 0.03%, P ＜ 0.03%, surplus is ferrum.