RU97117974A

RU97117974A - METHOD OF ELECTRIC ARC WELDING BY FLOATING ELECTRODE AND DEVICE FOR ITS IMPLEMENTATION

Info

Publication number: RU97117974A
Application number: RU97117974/02A
Authority: RU
Inventors: Г.Г. Валеев
Original assignee: Г.Г. Валеев
Filing date: 1997-10-27
Publication date: 1999-07-20

Claims

1. A method of electric arc welding with a consumable electrode in an atmosphere of air, based on fixing the insulated electrode fixedly at the junction between two pipes to be welded with an output, attaching one pole of a current source to the terminal, the second pole of which is connected to one or two pipes, and initiating an electric arc between the end electrode and pipes, characterized in that the electrode is performed as a part of a ring with a central angle φ satisfying the inequality:
φ <360 ^° / N,
where N is the number of electrodes made in the form of parts of the ring, stacked at one joint of the pipes to be welded, with an average radius equal to the average radius of the pipes being welded, with a width equal to the thickness of the pipe walls,
they shunt the electrode with a well-conducting bus through fusible jumpers, determine the power of the current source necessary for welding by the formula:
q = cFP _me / G (W),
where c is the speed of sound in the material of the electrode, cm / sec;
F is the cross-sectional area of the electrode, cm ² ;
P _me - the value of the excess vapor pressure of the metal, g / cm ² ;
G is the dimensionless Gruneisen coefficient,
an electric arc is excited between the electrode and the pipes to be welded, the current and voltage values are set on the current source, which correspond to the calculated power, the core and end surfaces of the pipes are melted with the help of an electric arc, which automatically spontaneously moves along the end of the core, cools the molten metal of the weld for spontaneously moving the weld pool and when the bath comes to the end of the joint, extinguish the electric arc by spontaneous breakage, in addition, leaving If not welded, the joint section is welded with a consumable rod electrode.

2. Device for electric welding, containing a melting insulated electrode with a lead, characterized in that a shunt bus with a lead and fusible jumpers are inserted into it, moreover, the electrode is made in the form of a part of a ring with a central angle φ satisfying the inequality:
φ <360 ^° / N,
where N is the number of electrodes stacked at one pipe joint,
the bus is also made in the form of a part of the ring with a central angle less than φ, jumpers connect the electrode and the bus electrically, in addition, the values of the electrical resistance of the shunt bus R _w , the electrical resistance of the jumper R _p , the electrical resistance of the electrode R _e and the number n of jumpers on one electrode satisfy the inequality:
(R _W + R _p ) <R _e / n.