Process for spot welding or soldering using resistance or inductive heating comprises determining the heat introduction by a controlled change of the current strength and the joining force depending on a selected cross-sectional contour of a joint auxiliary element inserted between components to be welded or soldered. An Independent claim is also included for a joint auxiliary element used in a contact region between two components.

Process for spot welding or soldering, e.g. metallic sheet components in car industry, using resistance or inductive heating comprises determining the heat introduction by a controlled change of the current strength and the joining force

FIELD: technological processesSUBSTANCE: method can be used for reconditioning worn-out surfaces of parts by electric contact welding of metal powders Performed is welding a filler material containing a steel mesh and a powder Determined is porosity of the obtained metal coating as the ratio of volume of pores, cavities and discontinuities to its total volume Filler material is used made in the form of a filled with granules of a metal powder container made of a steel mesh, gaps of which are less than sizes of the said granules Square of the container is selected in accordance with the square of the reconditioned surface taking into account its longitudinal and transverse deformations during welding Predetermined are the weight and the volume of the container mesh wires and the metal powder granules After welding the said filler onto the worn-out surface the metal coating thickness is measured and its total volume is determined Calculated is the volume of pores, cavities and discontinuities in the interlayer of the metal powder with due allowance for the said volume of the container mesh wires and the metal powder granulesEFFECT: method enables to obtain a high-quality metal coating and simplifies determination of its porosity1 cl, 4 dwg, 1 ex

Method for determining porosity of metal coating from filler metal powder

FIELD: welding.SUBSTANCE: invention can be used in restoration and hardening of parts by electrocontact welding of steel tapes. Perpendicular to the side of the filler tape facing the facing part, blind holes are made in the longitudinal and transverse directions at the depth equal to the belt thickness. Bridges are left between holes. Pitch of holes made in both directions is equal to 1.2–1.25 holes diameter and 3–4 times larger than tape thickness. Metal of bridges between holes is easily plastically deformed, which promotes formation of strong welded joint in solid phase.EFFECT: disclosed is filler tape for electrocontact welding.1 cl, 3 dwg

Filler tape for electrocontact welding

FIELD: restoration of parts.SUBSTANCE: invention can be used in the restoration and strengthening of parts by electric contact welding of steel belts. Before welding, the part is perforated from the side facing the filler tape by drilling rows of blind conical holes at an angle corresponding to the angle of the tape run-in with the electrode roller. The depth of the holes is equal to the difference between the thickness of the tape and the defective metal coating layer removed during subsequent machining. The pitch of the holes is taken to be equal to the feed of the roller-electrode along the axis of the shaft. The mode of electric contact welding is selected from the condition of complete filling of the volume of blind holes with filler metal. Welding of the additive is carried out on the jumpers between the rows of holes. When the heated to plastic filler metal moves along the surface of the part to be restored, dense hydroxide films are destroyed, which allows achieving the highest possible strength of the welded joint formed in the solid phase.EFFECT: shape and depth of the holes allow reducing the metal loss of the filler tape during drilling.1 cl, 1 ex, 6 dwg

Method for restoring shafts by electric contact welding of perforated filter tape

FIELD: technological processes.SUBSTANCE: invention relates to surfacing powders mixing devices and can be used in parts reconditioning and hardening by electric contact welding and other methods of recovery, in which surfacing powders are used. Measuring hopper comprises hopper for powder with bottom discharge funnel and drive mounted outside of it, kinematically connected with vertical rod located inside powder hopper connected with powder shutoff valve. On powder hopper axis binding substance container is arranged, made in form of vertical cylinder, which lower end is made in form of truncated cone, which is powder shutoff valve in mentioned bottom discharge funnel, and upper end is provided with cover. Rod is installed on binding substance container axis. Rod upper end is connected with drive via hole in container cover, and its lower end is binding substance shutoff valve in hole in vertex of said truncated cone. On rod stopper is fixed.EFFECT: invention enables to perform simultaneous supply of powder and binding substance, and control and batch their supply.6 cl, 1 dwg

Measuring hopper to supply powder and binder into welding zone

The rolled seam to join plates together, by resistance welding in a butt joint, is prepared by inserting a metallic powder (7) into the joint zone (a) as an added material. The powder covers the joint and has a chemical composition and grain size compatible with the welding conditions. During welding, the resistance heat generated by the electrodes (4,5) melts the powder to fill the joint (a) completely, and give a bond between the two plates (1,2). ADVANTAGE - The operation gives a total bond between the two plates and the material in the joint between them, so that welding faults are prevented to avoid later failure.

Weigelt Klaus Dr Ing

Papers

Plate butt welding - uses powder material inserted into joint to be melted by resistance heat from rolling electrodes