LOKERMANN GRAND PIPE 270 MULTI, Руководство пользователя, Страница: 4 / 16

GRAND PIPE 270 MULTI 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, etc.
The parameters of GRAND PIPE 270 MULTI 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.
GRAND PIPE 270 MULTI Characteristics
：
★ Input voltage from 110~460±15%(1~3): Multivoltage both sigle phase both three phase
★ DC Pulsed TIG and MMA, adopt IGBT and advanced PWM technology
★ High performance MCU, Digital control, Digital display, PFC technology
★ MMA for cellulosic electrodes
★ 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;
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.
GRAND PIPE 270 MULTI welding machine is suitable for all positions welding for various plates made
of stainless steel, carbon steel, alloyed steel, titanium, magnesium, copper, etc, which is also applied to
pipe installment, mould mend, petrochemical, architecture decoration, car repair, handicraft and
common manufacture.
GRAND PIPE 270 MULTI welding machine has excellent volt-ampere characteristic. Referring to the
following graph. In TIG welding, the relation between the rated loading voltage U2 and welding
current I2 is as follows:
When I2≤600A ， U2=10+0.04I2(V); When I2¬ ＞ 600A,U2=34(V).
2
Summary
2.1
Brief
Introduction
2.3
Volt-Ampere
Characteristic
67
34
10
0 600
I
2
（
A
）
U
2
（
V
）
Working
point
Volt-ampere characteristic
The relation between the
conventional loading
voltage and welding current