METHOD OF WEAR-RESISTANT LAY-BY-LAYER BUILDING-UP WELDING OF STEEL BEARING RACES OF ROTARY SUPPORTS OF JIB CRANES Russian patent published in 2014 - IPC B23K9/04 

FIELD: machine building.

SUBSTANCE: method of layer-by-layer wear-resistant building-up welding of steel bearing races of rotary supports of jib cranes in the medium of shielding gases includes the making of layers without preheating and after-welding heat treatment. The building-up welding is performed by stably austenitic welding materials in conditions excluding the quenching of the detail under the first layer. After building-up welding of the first layer and its curing the building-up welding of the second and consequent layers with chrome-manganese materials in conditions excluding the mixing and through penetration of the first layer, and also quenching of built-up detail. The first layer is made at a forward speed 2-5 m/h with stably austenitic welding materials of the type Sv-Kh15N25AM6 or welding rods EA-395/9, NIAT-5, ANZhR-1, ANZhR-2 and EA-48/N22. The second and consequent layers are made at a speed 18-25 m/h with austenitic chrome-manganese materials of the type Sv-Kh18N7G7 or welding rods TsNIIN-4.

EFFECT: excluding possibility of formation of hardening patterns in quenched steel, which result to cooling cracks under the building-up welding.

2 cl, 3 dwg