Metal fusion bonding – Explosive welding means
Patent
1987-11-04
1988-12-06
Godici, Nicholas P.
Metal fusion bonding
Explosive welding means
228107, 219 85, 219 95, 219 1053, 294192, B23K 1300
Patent
active
047890940
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to metal processing and welding by intense magnetic fields and, in particular, to a device for alignment of cylindrical workpieces for magnetic-discharge welding of metals.
BACKGROUND ART
The problem of metal processing and welding stabilization aimed at reducing rejects and saving metal has become extremely important. The quality of workpiece processing and welding largely depends on the accurate and durable adjustment of technological equipment and machine-tool attachments used in the production process.
Such requirements are particularly stringent in case of magnetic-discharge welding where only one discharge of the capacitor bank is required for welding and repeated discharges are of no use and the workpiece is rejected. Many researchers and product engineers are engaged in trying to solve the problem of alignment of workpieces affecting the quality of metal processing and welding.
Known in the art is a device for alignment of cylindrical workpieces (A. E. Slukhotsky, "Induktory", 1965, p. 24) which comprises aligning disks made of asbestos cement and installed on the butt face ends of the induction heater.
These disks are provided with openings through which pipes are supplied to the hardening zone.
But this device for alignment of workpieces is deficient in that the depth to which the pipe is introduced into the induction heater zone cannot be regulated. In addition, the asbestos cement soils the outer surface of workpieces to be welded together in the process of the magnetic-discharge welding.
Besides, this device for alignment of pipes cannot provide reliable insulation of the workpieces from the work-coils of the induction heater.
DISCLOSURE OF THE INVENTION
The invention is to provide a device for alignment of cylindrical workpieces for magnetic-discharge welding, which can ensure accurate positioning of workpieces in relation to one another and controlled depth of introduction of workpieces into the zone of the induction heater, while retaining the reliability, simplicity and durability of the device.
This is attained by that a device for alignment of cylindrical workpieces for magnetic-discharge welding, comprising aligning disks installed on the butt surfaces of an induction heater, according to the invention, is equipped with external and internal aligning sleeves installed in the induction heater coaxially and overlapping each other, the external aligning sleeve being made of a non-polarizable dielectric material and provided with a protrusion on the outer surface thereof, to which one of the aligning disks is contiguous to arrest this sleeve, while the internal aligning sleeve is made of a non-magnetic material having low conductivity and provided, on the inner surface thereof, with step-like shaped through slots and, on the outer surface thereof, with a protrusion limiting the depth of introduction of the internal sleeve into the external aligning sleeve and ensuring arrest of the internal sleeve in relation to the induction heater by means of a second aligning disk contiguous to said protrusion.
The external and internal aligning sleeves provided in the induction heater ensure external alignment of workpieces to be welded together in relation to each other.
The external aligning sleeve is made of a non-polarizable dielectric material in order to ensure reliable insulation of workpieces from the work-coil of the induction heater, while the protrusion or ledge on the external surface of the aligning sleeve permits this sleeve to be locked in relation to the induction heater in order to achieve stable welding conditions.
The internal aligning sleeve is made of a non-magnetic material having low conductivity in order to allow magnetic force lines free access to the workpieces and thus reduce to the minimum any losses of electromagnetic power and, also, to keep workpieces in place. The through shaped slots provided in the internal sleeve permit oxide films and gases to be removed from the welding zone.
The protrusion provided on the external surfac
REFERENCES:
patent: 3017483 (1962-01-01), Anderson
patent: 3699297 (1972-10-01), Grin et al.
patent: 4103813 (1978-08-01), Debeir
patent: 4513188 (1985-04-01), Katzenstein
A. E. Slukotsky, Inductory, p. 24, 1965.
A. E. Slukhotsky, "Induktory", 1979, Mashinostroenie (Leningrad), c.f., p. 15, drawing-7.
A. A. Dudin, "Magnitono-impulsnaya Svarka Metallov", 1979, Metallurgia (Moscow), c.f., pp. 18-19, drawing 6b,6d.
P. I. Orlov, "Osnovy Konstruirovania", Book I, 1977, Mashinostroenie (Moscow), c.f., pp. 494-499, 610-611.
Godici Nicholas P.
Heinrich Samuel M.
Institut electrosvarki imeni e.o. Patona
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