2.3
Brief
Introduction
GRAND TIG 200 DC PFC MV adopts the latest Pulse Width Modulation (PWM) technology and the
Insulated Gate Bipolar Transistor (IGBT) power modules. It uses switching frequencies in the
20KHz-50KHz ranges so as to replace the traditional line-frequency transformer type welding machines.
Thus, machines are characterized with portability, small size, lightweight, low energy consumption and
noise, etc.
GRAND TIG 200 DC PFC MV has excellent performance: constant current output makes welding arc
more stable; fast dynamic response speed reduces the impact from the arc length fluctuation to the
current; accurate stepless current adjustment and pre-setting function. There are also some automatic
protection functions for under voltage, over current, over heat, etc. inside the welder, when the
problems listed before occurred, the alarm light on the front panel is on and at the same time the
output current will be cut off. It can self-protect, prolong the usefull life, greatly improved the reliability
and practicality of the welding machine.
The parameters of the machine 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 arc length etc. When
welding, it takes high frequency and high voltage for arc igniting to ensure the success ratio of
igniting arc.
TIG DC PULSE Characteristics
:
★
DC Pulsed TIG and MMA, adopt IGBT and advanced PWM technology
★
High performance MCU, Digital control, Digital display
★
HF/Lift TIG, current down slope and up slope, gas post-flow, Pulse Frequency
★
Intelligent protection: over-voltage, under-voltage, over-current, over-heat
1. For MMA, polarity connection can be chosen according to different electrodes
,
please refer to
3.3.
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 as stable welding arc, low tungsten
pole loss, more welding current, narrow and 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. 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 microlite
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.
This machine has wide range of applications. Given its small size, light weight, easy and flexible
operation, it can be used in various kinds of environment, such as working aloft, field work, interior
decoration, etc.
GRAND TIG 200 DC PFC MV is suitable for all positions welding for various plates made of stainless steel,
carbon steel, alloyed steel, titanium, copper, etc, which is also applied to pipe installment, mould
mend, petrochemical, architecture decoration, car repair, bicycle, handicraft and common
manufacture.