US 5,852,272 A · Wear-resistant overlay forming method and wear-resistant composite members

Abstract

A wear-resistant overlay forming method wherein hard particles are supplied to a molten weld pool that is formed on a base material by an arc generated from an arc electrode to form a wear-resistant overlay containing hard particles on the base material, and wherein the hard particles are supplied to part of molten metal of the molten weld pool, the part being raised by the arc or flowing down owing to gravity. A wear-resistant composite member for cutting and removing rock and sand is designed such that the hard-facing deposit layers containing the hard particles are formed on the base material in a stripe pattern so as to run in the direction of friction produced by rock and sand or such that the hard-facing deposit layers containing the hard particles and soft-facing deposit layers made from soft material are formed on the base material in a stripe pattern so as to run in the direction transverse to the direction of friction produced by rock and sand, being alternately aligned in the direction of friction.

Claims12

Dependent claims

A wear-resistant overlay forming method wherein hard particles are supplied to a molten weld pool that is that is formed on a surface of a base material by an arc generated from a tip of an arc electrode to form a wear resistant overlay containing the hard particles on the surface of the base material, comprising:

inclining the surface of the base material with respect to a horizontal plane by an angle .alpha., wherein 25.degree..ltoreq..alpha..ltoreq.90.degree.;
establishing a welding direction of the base material with respect to the tip of the arc electrode wherein the molten material flows downward away from the tip due to gravity;
generating the arc from the tip of the arc electrode while the tip is oriented at an angle .theta., wherein .theta..gtoreq.90.degree. with respect to the welding direction to create the molten weld pool, which molten weld pool flows by gravity downwardly with respect to the weld direction;
supplying the hard particles to the molten metal at a location upstream of the location of impingement of the arc with the molten metal pool when 25.degree..ltoreq..alpha.<90.degree.;
and
supplying the hard particles to the molten metal at a location coincident with the location of impingement when .alpha.=90.degree..

3 more elements

A wear-resistant overlay forming method wherein hard particles are supplied to a molten weld pool that is formed on a base material by an arc generated from an arc electrode having a longitudinal axis to form a wear-resistant overlay resulting in a hard-facing deposit layer containing the hard particles on the base material, the method comprising:

inclining a surface of the base material in a welding direction at an angel which ranges from not less than 0.degree. to less than 25.degree. with respect to a horizontal plane;
inclining the arc electrode so that the longitudinal axis thereof is at a predetermined angle relative to a line perpendicular to the surface of the base material, such that the tip of the electrode is oriented downstream of the welding direction;
and
supplying the hard particles to part of the molten metal of the molten weld pool, said part of the molten metal being raised by the action of the arc and being located behind an intersecting position in the welding direction and flowing downward due to gravity because the base material is inclined, the intersecting position being a position where an extension of the axis of the arc electrode intersects the surface of the base material.

1 more element

Dependencies are inferred from the claim text.

Wear-resistant overlay forming method and wear-resistant composite members

Life of this patent

Wear-resistant overlay forming method and wear-resistant composite members

Life of this patent

Abstract

Claims12