Vector Welding C-Series Operating Instructions Manual page 38

DC PULSE SERIES EQUIPMENT
T-SERIES
CHAPTER 4
DC PULSE SERIES EQUIPMENT
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DC PULSE SERIES EQUIPMENT
1.1 Brief Introduction
T231/T331 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 T231/T331 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.
T231/T331 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 .
Summary
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