Electric heating – Metal heating – For bonding with pressure
Patent
1987-11-19
1989-02-07
Goldberg, E. A.
Electric heating
Metal heating
For bonding with pressure
219101, B23K 900
Patent
active
048033308
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to equipment for flash butt welding and has specific reference to machines for ring seam welding of pipes.
PRIOR ART
When a machine for flash butt welding is moved by a roller supported driving means from one butt joint to another through the bore of the pipe, the current-applying clamping blocks must stay clear of the inner wall of the axis of the displacing machine and that of the pipe or a too narrow clearance between the current-applying blocks and the inner pipe wall can cause the blocks to contact surface irregularities of the pipe wall or remnants of flash thereon. Rapid wear of the current-applying blocks and breakage or stoppage of the welding machine are therefore frequent occurences.
Known in the art is a machine for flash butt welding of pipes (cf. USSR Inventor's Certificate No. 286 103, Cl. 21h 29/10, 1969) in a housing whereof there is secured a rod carrying pipe clamps each whereof is provided with a flanged slider located on the rod with provision for longitudinal displacement, whereby every slider interacts through a projection with a turning lever carrying a supporting roller and through the flange with a bar of a spring-loaded block fitted to the housing. The tension of the springs acting on the blocks is selected depending on the weight of the structure. If the radial displacement of a supporting roller exceeds that of the rest of rollers, as this may be the case when the inner wall of the pipe is elliptical, the turning lever of the roller concerned acts with its projection on the slider which transmits this action to the rest of rollers. This brings about a self-alignment of the machine for flash butt welding throughout the process.
Nevertheless, to fit a new pipe to the machine for welding is a problem because of the initial setting of the rollers which exceeds a maximum possible pipe diameter, and much effort is required in order to overcome the tensions of springs the rollers are subjected to.
Also known in a machine for flash butt welding of pipes, preferably those of large diameter, (cf. USSR Inventor's Certificate No. 292 743, Cl. B23K 11/04, 1969) in a housing whereof there are provided clamping means, a flashing-and-upsetting means and two retaining means which are located at either end of the pipes welded together to sustain the upsetting force. The machine is provided with aligning rollers with individual actuating means which cause the rollers to displace radially towards the inner walls of the pipes welded. The aligning rollers are fitted each to an end of a bellcrank and the other end of every bellcrank contacts a common disk which, being displaced along the housing of the machine by an individual hydraulic actuator, causes the rollers to swing about the fulcrum of every particular bellcrank so as to come closer to, or farther from, the inner walls of the pipes welded. An aligning mechanism of the above layout invites no difficulties in fitting the welding machine into the hore of a new pipe.
However, this mechanism and the indiviudal means of actuating the aligning rollers complicate the construction and increase the weight of the machine. Additional operations which must be coped with during welding in this case render automatic control of the machine a problem.
Further known is a machine for flash butt welding of pipes which operates in the bore of the pipes welded together (cf. USA Pat. No. 4,273,985, Cl. B23K 11/04, dated June 16, 1981).
The known machine for flash butt welding of pipes consists a housing which is aligned with the axis of the pipes welded and has a first supporting disc and a second supporting disc located its ends. A pipe flashing-and-upsetting means capable of displacing along the housing due to individual hydraulic actuators is fitted to the housing with the aid of a carrier next to the second supporting disc. Means of clamping the pipes welded with carriers fitted to the housing and with individual hydraulic actuators serving to displace said means along the axis of the housing are located the pipe flash
REFERENCES:
patent: 3684856 (1972-08-01), Lifshits et al.
patent: 4012619 (1977-03-01), Lifshits et al.
patent: 4273985 (1981-06-01), Patson et al.
patent: 4323752 (1982-04-01), Paton et al.
patent: 4436974 (1984-03-01), Lebedev et al.
Galian Boris A.
Kuchuk-Yatsenko Sergei I.
Sakharnov Vasily A.
Zelensky Vladimir F.
Chiu Melissa C.
Goldberg E. A.
Institut Elektrosvarki Imeni E.O. Patona Akademii Nak Ukrainskoi
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