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DC PULSE SERIES EQUIPMENT
Summary
2.1 Brief Introduction
Tokyo2300 welding machine adopts the latest pulse width modulation (PWM) technology
and insulated gate bipolar transistor (IGBT) power module, which can change work frequency
to medium frequency so as to replace the traditional hulking work frequency transformer
with the cabinet medium frequency transformer. Thus, its characterized with portable, small
size, light weight, low consumption and etc.
The parameters of Tokyo2300 on the front panel all can be adjusted continuously and
steplessly, such as start current, crater arc current, welding current, base current, duty ratio,
upslope time, downslope time, pre-gas, post-gas, pulse frequency, hot start, arc force and
length etc. When welding, it takes high frequency and high voltage for arc igniting to ensure
the success ratio of igniting arc.
Tokyo2300 Characteristics:
◆MCU control system, responds immediately to any changes.
◆High frequency and high voltage for arc igniting to ensure the success ratio of
igniting arc.
◆ With special means, even if arc-break occurs the HF will keep the arc stable.
◆Pedal control the welding current.
◆In DC TIG without HFopertation, If the tungsten electrode touches the workpiece
when welding, the current will drop to short-circuit current to protect tungsten.
◆
Intelligent protection: over-current, over-heat, when the mentioned problems
occoured, the alarm lamp on the front panel will be on and the output current will
be cut off. It can self-protect and prolong the using life.
◆p u r p o s e s : D C i n v e r t e r T I G , E x c e l l e n t p e r f o r m a n c e o n c a r b o n s t e e l ,
s t a i n l e s s s t e e l , t i t a n i u m e t c .
According to choosing the front panel functions, the following four welding ways
can be realized.
DC MMA
DC TIG
DC Pulse TIG
1. For DC MMA, polarity connection can be chosen according to different electrodes;
2. For DC TIG, DCEP is used normally (workpiece connected to positive polarity, while
torch connected to negative polarity). This connection has many characters, such
a s s t a b l e w e l d i n g a r c , l o w t u n g s t e n p o l e l o s s , m o r e w e l d i n g c u r r e n t , n a r r o w a n d
deep weld;
3. DC Pulsed TIG has the following characters:
1) Pulse heating. Metal in Molten pool has short time on high temperature status
and freezes quickly, which can reduce the possibility to produce hot crack of the
materials with thermal sensitivity .
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DC PULSE SERIES EQUIPMENT
2) The workpiece gets little heat. Arc energy is focused. Be suitable for thin sheet
and super thin sheet welding.
3) Exactly control heat input and the size of the molten pool. The depth of penetration
is even. Be suitable for welding by one side and forming by two sides and all position
welding for pipe.
4) High frequency arc can make metal for microliter fabric, eliminate blowhole and
improve the mechanical performance of the joint.
5) High frequency arc is suitable for high welding speed to improve the productivity.
To k y o 2 3 0 0 – s e r i e s w e l d i n g m a c h i n e s i s s u i t a b l e f o r a l l p o s i t i o n s w e l d i n g f o r
various plates made of stainless steel, carbon steel, alloyed steel, titanium, magnesium,
cuprum, etc, Which is also applied to pipe installment, mould mend, petrochemical,
architecture, decoration, car repair, bicycle, handicraft and common manufacture.
MMA-------Manual Metal Arc Welding
PWM-------Pulse-Width Modulation
IGBT--------Insulation Gate Bipolar Transistor
TIG----------Tungsten Insert Gas Welding
2.2 Working Principle
The working principle of Tokyo2300 welding machines is shown as the following
figure. Single-phase 230V work frequency AC is rectified into DC(about 312 V), then
is converted to medium frequency AC (about 20-40KHz) by inverter device (IGBT module),
after reducing voltage by medium transformer (the main transformer) and rectifying
rectifying by medium frequency rectifier (fast recovery diodes),then is outputted DC .The
circuit adopts current feedback control technology to insure current output stably.
Meanwhile, the welding current parameter can be adjusted continuously and steplessly
to meet the requirements of welding craft.
230V
Summary
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