SU703270A1 - Method of quality control at contact welding - Google Patents

Method of quality control at contact welding

Info

Publication number
SU703270A1
SU703270A1 SU772546776A SU2546776A SU703270A1 SU 703270 A1 SU703270 A1 SU 703270A1 SU 772546776 A SU772546776 A SU 772546776A SU 2546776 A SU2546776 A SU 2546776A SU 703270 A1 SU703270 A1 SU 703270A1
Authority
SU
USSR - Soviet Union
Prior art keywords
welding
acceleration
quality
relief
signal
Prior art date
Application number
SU772546776A
Other languages
Russian (ru)
Inventor
Лев Григорьевич Миронов
Леонард Константинович Афанасьев
Саид Сулейманович Альмухаметов
Сергей Федорович Савичев
Юрий Васильевич Огибайлов
Виталий Алексеевич Зайцев
Original Assignee
Предприятие П/Я В-2763
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Предприятие П/Я В-2763 filed Critical Предприятие П/Я В-2763
Priority to SU772546776A priority Critical patent/SU703270A1/en
Application granted granted Critical
Publication of SU703270A1 publication Critical patent/SU703270A1/en

Links

Description

one

The invention relates to the field of welding, in particular to contact relief welding.

There is a method of quality control in contact welding, in which the measured Nst is the acceleration of the moving electrode and compares the received electrical signal with a reference signal corresponding to the quality welded joint 111.

According to a known method, accelerations are measured both when lifting and lowering a moving electrode. It is necessary to point out the qualitative difference in the processes of electrode convergence in spot and relief welding. In point-to-point welding, the convergence of the electrodes: is a consequence of the process of crystallization of the metal of an already existing welded joint. In the relief welding process of formation, the joint is preceded by an intense convergence of the electrodes due to the deformation of the relief, which slows down as the relief relief increases, and only after the contact area has stabilized.

the relief zone begins the process of welded joint formation by the mechanism of ordinary spot welding.

Depending on the welding mode of the relief geometry, the plasticity of the weldable metalals, the type of welding equipment, it is sometimes impossible to accurately determine the period of thermal expansion and crystallization of the molten core of the weld point, as a result of which the existing method of control of spot and weld welding is unacceptable for control of relief welding. In relief welding, it is more expedient to measure the acceleration of the approach of the electrodes during the period of intensive relief painting before the melting of the metal parts of the welded parts.

The aim of the invention is to increase the reliability of control in relief welding.

Claims (2)

  1. This is achieved in that according to the proposed method, the amplitude of accelerations of accelerated and slow motion of the moving electrode is measured in the period from the moment the welding current is switched on until the welding oetanaft begins to melt and the electrical signal from the sum of these amplitudes is compared with the reference signal. FIG. 1 shows a pattern for performing relief welding; in fig. 2 is an oscillogram of welding current 1 and a signal Ug, proportional to the acceleration of the approach of the electrodes. The part 1 with the relief 2 made on it and the part 3 is squeezed between the movable 4 and the stationary 6 flat electrodes with the welding force Fee. With the flow between the electrodes 4 and 5 of the welding current. LCB phyuiscurs intensive relief warming
  2. 2. The metal of the relief 2, heated above the temperature of the softening point, is squeezed out into the gap between the parts 1 and 3 under the action of the pre-produced welding force roar. At the same time, the upper p6dvini1 electrode 4 is lowered, moving closer to the stationary electrode 5 with some acceleration. Acceleration is measured from the moment the welding current is switched on 1cv. up to the moment of full see of a relief. Acceleration of the approach of the hedgerogs is converted by means of an acceleration sensor 6 mounted on the movable electrode 4 into an electrical signal received in block 7 of the comparison. In comparison unit 7, the measured electrical signal proportional to the acceleration of the approach of the electrodes 4 and 5i is compared with this. It is determined by the electrical signal, and the error signal is judged on the quality of the welded joint. An electrical signal proportional to the acceleration consists of a negative (1st) and positive {2nd) half-waves. The software is measured and the sum of the amplitudes of both half-waves is calculated. A welded joint is considered poor quality if the sum of the amplitudes of the measured signal is more than the maximum allowable c-d or less than the minimum allowable 6-f value. PuTemus; / GanbV), THEN with high-quality welding of sheet nickel parts with a thickness of 0.2 mm, the optimum pull-out diameter (1.3-1.5 mm). The total amplitude of the first and second half-wave signals from the acceleration sensor should be no more. 280 mV and at least 250 mV. Welded specimens of nickel 0.2 mm thick on an MTK-1601 type machine underwent welding, alternately changing the main mode parameters within the following limits: capacitor bank C-630-1280 microfarads working capacity, UK 160-220 V voltage capacitors, welding force fcB. 3-1О кГс, transformation ratio, бО. The total magnitude of the amplitudes of the signal from the acceleration sensor was 265272 mV, which indicates the normal quality of the compounds obtained. Indeed, during mechanical testing, all samples were destroyed in the base material with a break: 1.38-1.46 mm. A 25% decrease in welding current led to a 45–40% decrease in the strength of welded joints. The total magnitude of the amplitude of the signal from the sensor. This was less than the minimum acceptable for high-quality welding and was 185-197 mV. As a result of processing the data of the experiment, it was found that with a constant acceleration of the electrode approach, the strength variation of the welded joints is 8-12%. The use of the control method will improve the reliability of assessing the quality of joints, and, consequently, expand the area of implementation of the process of relief welding in the manufacture of critical products that require high stability of the quality of welded joints. Claims. The method of quality control in contact welding, in which the acceleration of the moving electrode is measured and the resulting electrical signal is compared with a reference signal corresponding to a quality welded joint, from -. so that, in order to reliably control under relief welding, the amplitudes of the accelerations of the accelerated and slow motion of the moving electrode are measured during the period from the start of the welding current to the beginning of melting the signal is an electrical signal from the summation of these amplitudes. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2305233 / 25-27, cl. In 23 K 11/24, 1975.
    . I Fcb
SU772546776A 1977-11-25 1977-11-25 Method of quality control at contact welding SU703270A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU772546776A SU703270A1 (en) 1977-11-25 1977-11-25 Method of quality control at contact welding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU772546776A SU703270A1 (en) 1977-11-25 1977-11-25 Method of quality control at contact welding

Publications (1)

Publication Number Publication Date
SU703270A1 true SU703270A1 (en) 1979-12-15

Family

ID=20734444

Family Applications (1)

Application Number Title Priority Date Filing Date
SU772546776A SU703270A1 (en) 1977-11-25 1977-11-25 Method of quality control at contact welding

Country Status (1)

Country Link
SU (1) SU703270A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4376883A (en) * 1980-07-30 1983-03-15 American Can Company Monitoring weld quality via forging assembly dynamics
US4376884A (en) * 1980-07-30 1983-03-15 American Can Company Closed loop control of continuous seam resistance heated forge welding cylinders
US4447699A (en) * 1980-07-30 1984-05-08 American Can Company Closed loop control of continuous seam resistance heated forge welding cylinders

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4376883A (en) * 1980-07-30 1983-03-15 American Can Company Monitoring weld quality via forging assembly dynamics
US4376884A (en) * 1980-07-30 1983-03-15 American Can Company Closed loop control of continuous seam resistance heated forge welding cylinders
US4447699A (en) * 1980-07-30 1984-05-08 American Can Company Closed loop control of continuous seam resistance heated forge welding cylinders

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