2. • The welding together of metal parts by heating them
up to melting point is one area where conventional
control equipment, such as mercury-vapour values of
the grid-control or the ignitron type, has given place
to thyristorized equipment.
Introduction
4. Resistance Welding:
• Alternating current is used
• It can ne implemented for brass, steel, copper, iron and
other metals.
• A) butt jointing B)spot welding
• AC controller using thyristors.
7. Arc Welding:
• Direct voltage of 40 to 60 V and direct current of 500 to
800A are required.
• single-phase thyristor bridge are used to provide the
required load voltage.
• For low ripple content inductor connected at the load.
10. Switch mode Welder:
• There is substantial reduction in the size and weight of the
welding unit because of the high frequency transformer, its
efficiency being above 85%.
• Transformer also used for electrical isolation purpose.
• Small inductor at the output side serve to minimize the
ripple content.
14. Welding rod is made up of:
A welding electrode is made up of two parts: the actual metal, and the flux
coating. The metal can vary from mild-steel, cast iron, stainless steel, high-tensile
steel, copper, bronze, brass, or aluminum. The metal is then wrapped in a flux
coating that is blends of cellulose, which is used by plants to give them flexibility,
iron powder, and hydrogen. It is also blended with some Sodium, Titania and Potassium.
The flux coating makes the electrical currents flow more evenly during the weld.
15. ARC 200 Welding Machine
MODEL ARC-200
Input Supply (V) AC220V±15%
Frequency (Hz) 50/60
Rated Input Current
(A)
43.5
Rated Output
Voltage (V)
28
No Load Voltage (V) 58
Duty Cycle (%) 60
Power Factor 0.73
16. Spot Welding Machine
PARAMETER/MODEL JMW 250 JMW 400
Rated input Power 10 KVA 19 KVA
Welding Current @
60% Duty Cycle
250 A 400 A
100% Duty cycle 180 A 320 A
Open Circuit Voltage 18 to 40 V 18 to 48 V
Input Voltage III phase, 415 V AC, 50 Hz
Cooling Forced Air cooled
Insulation Class H
Wire Size Steel 0.8, 1 mm 0.8, 1.2 mm
Aluminium 0.8,1,1.2 mm
Drive Roll 2
