Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
  • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
  • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
  • C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
  • B23K35/24—Selection of soldering or welding materials proper
  • B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550°C
  • B23K35/327—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550°C comprising refractory compounds, e.g. carbides
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12014—All metal or with adjacent metals having metal particles
  • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
  • Y10T428/12049—Nonmetal component

Definitions

• cemented carbides can be welded in inert-gas-atmosphere either with or without admixes of auxiliary metals; this process has proved especially successful in bu-ilt-up-welding for making tools with cutting-edges. In this process also rods, containing cemented-carbides can be used as admixes.
• this method only could be applied for relatively small surfaces, :i.e. surfaces of but a few square-cm., armor-platings on greater surfaces being sensible towards crack-formation and being likely to chip off if exposed to impact-stresses.
• This invention deals with an improvement of that wellknown process, enabling armor-plating of greater surfaces, especially of round pieces entirely homogeneously, without any crack-formation involved.
• the auxiliary metal used for preparing *admixes of sintered-carbides is very important.
• the auxiliary metal used for those admixes is supposed to contain 5100% Ni, 0-95% Fe and/or 030% Cr.
• this invention relates to a process of preparing hard and wear-resistant surfaces by built-up-arc-welding in inert gas-atmospheres, whereas admixes of sintered carbides are used, which primarily consists of tungstencarbides which may be combined with other cemented carbides and of 5-30% auxiliary metal; this process is characterized by the fact, that the auxiliary metal used for armor-plating great surfaces, which are sensible to wards crack-formation, especially for armor-plating round pieces, consists of 5100% Ni, 0-95% Fe and/or 030% Cr, besides unavoidable impurities.
• tungsten-carbide which is supposed to be the main component, its percentage being supposed to exceed 50%
• carbides of molybdenum, chromium, tantalum, niobium, titanium, zirconium and similar can also be used.
• the auxiliary metal either can be pure nickel-powder or nickel-powder mixed with powdered iron or chromium; this auxiliary metal is added to the powdered mixture, which is to be sintered and to be pressed for preparing the admix.
• Powdered austenitic Cr-Ni-steel also can be applied as auxiliary metal.
• Admixes preferably are made in the usual manner: the powdered mixture, consisting of cemented carbides and binding-metal is mixed with an organic binding-agreant, such as synthetic resin; this mixture is extruded to rods, which subsequently are sintered at temperatures ranging between 900 and 1300 C.
• admixes as suggested by this invention are used for welding in inert atmospheres, hardnesses ranging between 64 and 67 Rockwell-units are achieved.
• the favourable effect of binding-metals added to those admixes evidently is due to formation of a viscous transition-Zone between the admix and the basic material. This enables continuous building up of thicker layers without any crack-formation involved during argon arc-welding. Those layers can have thicknesses ranging between 4 and 6 mm. It is also possible to apply several layers by built-up-welding without any crack-formation involved.
• a process of hard facing by shielded arc welding employing a hard facing sintered rod produced by molding and sintering at a temperature of 900-1300 C. an admixture of powdered materials comprising a major portion of hard metal carbides and 5% to 30% of a cobalt free alloy consisting essentially of a metal selected from the group consisting of nickel, iron and chromium and mixtures thereof, at least 5% nickel being present in the alloy and less than 30% chromium being present in the alloy and an organic synthetic resin as a binding agent.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Powder Metallurgy (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Nonmetallic Welding Materials (AREA)
• Arc Welding In General (AREA)

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Publications (1)

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ID=3542667

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Cited By (14)

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Citations (13)

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• 1959
  • 1959-04-18 AT AT293759A patent/AT217818B/de active
• 1960
  • 1960-04-11 US US21083A patent/US3109917A/en not_active Expired - Lifetime
  • 1960-04-12 CH CH410860A patent/CH424434A/de unknown
  • 1960-04-12 GB GB12983/60A patent/GB904652A/en not_active Expired
  • 1960-04-12 DE DEB57461A patent/DE1242984B/de active Pending

Patent Citations (13)

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