SU1623847A1 - Method of resistance projection welding of parts of different size - Google Patents

Abstract

The invention relates to contact welding. The purpose of the invention is to improve the quality of the welded joint due to the increase in durable tees. Electrodes of the welding machine are mounted on the parts to be welded. At the same time, the electrodes have unequal diameters, a stepwise opening along the axis of symmetry is performed in the electrode of larger diameter, and the maximum hole diameter is larger than the maximum size in the plan of the smaller dimensions, and The diameter of the hole is equal to the diameter of the electrode of a smaller diameter. Moreover, on the working surface of the electrode of a larger diameter, grooves are made in a number that is a multiple of two. The electrodes are mounted on the parts on one side of them. In this case, a larger diameter electrode is installed on a larger part, and a smaller diameter electrode is installed on a smaller piece, and a smaller diameter electrode is installed 1 in the hole of the electrode more about the diameter. Electrodes are electrically isolated relative to each other. In this case, the path of the passage of welding current through large parts to the place of formation of a welded joint is great, self-extinguishing of electromagnetic fields induced in the parts is carried out, and the heat transfer to the electrode of a larger diameter is reduced. Thus, the heating temperature of the surfaces to be welded is optimized, the strength and, consequently, the quality of the joint are increased. 1 il. about yu (L S

Description

The invention relates to a technique for resistance welding, in particular to methods of contact relief welding of parts of unequal sizes.

The purpose of the invention is to improve the quality of the welded joint in contact relief welding of parts of unequal sizes by increasing the strength.

The drawing shows the welded parts of unequal sizes before the contact relief welding.

The technical essence of the invention is as follows.

Weld surfaces of parts 1 and 2 of unequal dimensions are prepared. Prepared welded parts 1 and 2 are placed in the machine for

contact relief welded. In parts 1 and 2, electrodes 3 and 4 of the machine are installed, while electrodes 3 and 4 are of equal diameters. In electrode 3 of larger diameter, a stepped hole 5 is made along the axis of symmetry, and the maximum diameter of the hole 5 is larger than the maximum size 1 is smaller, and the minimum diameter of the hole 5 is equal to the diameter of the electrode 4 of a smaller diameter. In addition, grooves 6 are made in the working surface of the electrode 3 in a multiple of two. Electrodes 3 and 4 are installed on parts 1 and 2 on one side of them. In this case, the electrode 4 is mounted on the component 1, and the electrode 3 is mounted on the large-sized component 2, the electrode 4 is installed in the hole of the electrode 3, the electrodes 3 and 4 are electrically insulated from each other. Details 1 and 2 are welded.

The physical essence of the invention is as follows. When using the invention in the process of contact relief welding of parts of unequal sizes, the path of the welding current through a large-sized welded part to the place of formation of the welded joint increases, self-extinguishing of electro-magnetic fields induced in the parts being welded is performed, and the heat sink in the welding is reduced. car of larger diameter. This optimizes the heating temperature of the surfaces being welded. As a result, the strength and, consequently, the quality of the joint increase.

Contact relief welding of parts of unequal sizes of steel grade 08КП (GOST 1050-74), a large part of which had dimensions: length 100.0 mm; width 100.0 mm; thickness 2.5 mm, and the smaller part had the dimensions: length 30.0 mm; width 10.0 mm; thickness 1.0 mm, performed as follows. On the welded part of smaller sizes, a relief with a radius of 4.0 mm and a height of 0.8 mm was stamped. The welded surfaces of the parts were prepared using conventional technology. Prepared welded parts were placed in a welding machine brand MT 1222 UHL 4 (TU 16-539.930-79). The parts placed in the machine were installed

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machine bores In this case, the electrodes were made with diameters of 70 mm and 16 mm, a stepped hole was made in the electrode with a diameter of 70 mm along the axis of symmetry, the maximum diameter of the hole was 36 mm, and the minimum diameter of the hole was 16 mm. electrode surfaces were not grooved, or one or two, or three, or four grooves. Electrodes were installed on parts on one side of them. At the same time, a larger diameter electrode was installed on a large-sized part, and a smaller diameter electrode was installed on a smaller-sized part, the smaller diameter electrode was installed in the hole of a larger diameter electrode, electrically insulating the electrodes with respect to each other. The parts were welded. Welding mode parameters: compression force 0.08 MPa; compression time 0.12 s; welding current 1.00 kA; welding time 0.08 s; number of pulses 2; pause time 0.06 s.

Weld joints were tested for peel.

The average value of the force of separation of the joints obtained under optimal conditions and parameters of the welding mode was 6,750 N.

The use of the invention in contact relief welding of unequal-sized parts improves the quality of the welded joint.

Claims (1)

The method of the contact relief welding of unequal parts, in which electrodes of the welding machine are installed on the parts to be welded, characterized in that, in order to improve the quality of the welded joint by increasing strength, the electrodes perform unequal diameters, in the electrode of larger diameter they perform stepwise the hole along the axis of symmetry, the maximum diameter of the hole is larger than the maximum size in terms of parts of smaller dimensions, the minimum diameter of the hole is equal to di meter smaller diameter electrode on the working surface of the electrode is performed the larger diameter grooves, whose number is multiple of two, the electrode is mounted on the larger diameter de- the hoist is large, and the electrode of smaller diameter is installed on the part of smaller size in the hole a larger diameter electrode, electrically isolating the electrodes from each other. No ///////////////// lt7 // ll