THE NEW-TYPE MTM-50-75-U SPOT-WELDING MACHINES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600310623-5
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: August 12, 2011
• Sequence Number: 623
• Publication Date: May 31, 1950
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/08/17: CIA-RDP80-00809A000600310623-5
CLASSIFICATION YAt
CENTRAL INTELLIGENCE AGENCY REPORT
INFORMATION FROM
FOREIGN DOCUMENTS OR RADIO BROADCASTS CD NO.
COUNTRY USSR DATE OF
INFORMATION
SUBJECT Scientific - Welding equipment
HOW
PUBLISHED Monthly periodical
WHERE
PUBLISHED Moscow
DATE
PUBLISHED Nov 1949
LANGUAGE
DATE DIST. .71 May 1950
SUPPLEMENT TO
REPORT NO.
OF THE. AR STATES n7MU TNS ^SANINS OF RSFlONASS ACT SO
r. S. C.. SI AND IT*. AMURSO. ITS TNANSNIISION ON THE IRSRATION
OF A. CoNTUil IN ART MARNSN TO A11 UMAUTNOUIIED PERSON IS FNO?
NISITS! MT LAW. n-NOOUCTIOI OF Toll FORM IS FSOMISITSO.
Vestnik Elektropromyshlennosti, No 11, 1949.
Engr B. I. Kalinkin
Electric Welding Machine Plant
Ministry of Electrical Industry
r digest]
The normal stationary machines produced for spot welding comprise a large
group of pedal spot-welding units of various power, and spot-welding machines
with pneumatic operation and timing control, such as Types MIP-75 and MDT-75.
The machines of the first group, with foot-pedal operation, have an output of
about 450 to 600 spot welds per hour, which at present cannot satisfy the de-
mands of industry. Machines of the second group, which have far higher output
and a number of other advantages, cost several times as much and have a complex
electrokinematic scheme.
An electric welding machine plant of the Ministry of the Electrical In-
dustry has begun series production of modernized Type MPM-50-75-U spot welding
machines, with motor drive, capable of welding speeds of up to 3,000 spot welds
per hour. These spot welding machines are best suited for automatic operation
in the welding of parts of one type. However, the design of the machines makes
nonautomatic work possible simply by a slight adjustment taking one to 2 minutes.
This enables the range of thickness of the welded material to be considerably
increased. During nonautomatic work, the time of welding current flow and the
time during which the welded parts are kept under pressure can be altered as
desired.
The main advantages of the MTM-50-75-U machines are simplicity of design
and maintenance, high productivity, and good welding quality with simple prepara-
tion of the work.
M
NSRB
FBI
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 Sanitized Copy Approved for Release 2011/08/17: CIA-RDP80-00809A000600310623-5
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The }'ousing of the machines includes a single-phase transformer (Type KTE-
134-10 in 50 kilovolt-amperes machines, or KTE-213 for 75) whose secondary con-
sists of water-cooled hollow conductors. Taps on the primary provide the usual
control over secondary voltage (MrM-50-U, 6 steps from 2.9 to 5.0 volts; MTM-
75-U, 8 steps from 3.5 -7.0 volts).
The flow of the welding current is regulated by a cam-plate arrangement
in which separate plates can be spread out to cover a wide arc (0.52 seconds
maximum current flow) or brought together (0.12 seconds flow).
The preliminary and welding compression is obtained by a lever and spring
mechanism and an eccentric cam driven by the electric motor through reduction
gears. Pressure applied to a foot pedal releases the cam mechanism and causes
the work to be compressed between the electrodes. In automatic work, keeping
the pedal depressed produces a series of separate spot welds. The desired time
lag is achieved by an additional lever mechanism which stops the cams in the
extreme lower position of the top electrode.
By means of these devices and the control pedal, it is possible to ensure
the desired conditions and to select a pressure curve corresponding to the
particular case of welding. The contact pressure on the electrodes is regu-
lated by adjusting a nut which creates the preliminary pull on the main spring.
A divided scale on the spring permits checking the pressure and facilitates
selection of proper operating conditions.
The Type MPM-50-75-U machines can be installed on a concrete foundation
or on wooden blocks. Since the machine is water-cooled, water must be sup-
plied from a pipe line. Each time before beginning work, the cooling system
should be carefully checked to assure normal thermal conditions which are
extremely important to proper operation. A drainage system is also necessary,
and in addition, the machine should be grounded.
The ohmic resistance of the secondary circuit should be systematically
checked under operational conditions. Before starting work, it should be within
50-75 microhms.
The technical data for Type MPM-50-U and Type MPM-75-U machines, respec-
tively, is as follows: primary voltage, 220,380,500 volts in each case; continuous
rating, 17.7 and 26.4 kilovolt-amperes; 12.5 percent repeated short-time duty,
50 and 75 kilovolt-amperes; automatic operation, 4 and 6 millimeters maximum
material thickness at 3,000 spot welds per hour; nonautomatic, 12 and 16 milli-
meters thickness, and 240-450 and 180-380 spot welds per hour; useful overhang
of electrodes, 300 millimeters, water consumption, 400 and 500 liters per second
Lsic7; working travel of electrodes, 40 millimeters; opening of electrodes,
150 millimeters; current, 10,000 and 12,000 amperes; maximum pressure, 250 and
350 kilograms; motor type, I-10/40 (0.25 kilovolt-amperes, 1,440 rpm); dimensions
(depth, width, and height in millimeters) 955 x 655 x 7290 and 1,075 x 655 x
1,290; weight, 400 and 480 kilograms.
c i`ii t
Sanitized Copy Approved for Release 2011/08/17: CIA-RDP80-00809A000600310623-5