Specifications

Transtig 200Pi, 250Pi, 300Pi

3. General Information

The Transtig 200Pi, 250Pi, 300Pi are light weight, constant current power sources incorporating the latest

digital inverter technology to provide exceptional DC arc characteristics. TIG welding features include

torch trigger latch operation (Slope), pre/post gas flow control, pulse control, spot weld control, TIG DC

HF start, TIG DC lift arc start, hot start control and Up/Down Slope (crater fill) control.

The Transtig 200Pi, 250Pi, 300Pi also has outstanding arc characteristics across a wide range of Manual

Metal Arc Welding (MMAW) electrodes. MMAW welding features include built in VRD, hot start control

and built-in arc force function.

Welding trials, with Voltage Reduction Device turned ON, have shown:

♦ A superior arc initiation characteristics with all types of electrodes due in part to the very fast response

time of the machine once a resistance of less than 175 ohms is sensed, but also due to the hot-start

feature;

♦ Excellent arc stability afforded by the digital inverter technology;

♦ Good restrike characteristics with rutile coated and iron-powder electrodes (even though the machine is

in the low OCV mode), made possible by the fast response time and the presence of the hot-start

feature.

Typical applications are maintenance, site work, breakdowns, repairs, light structures and is supplied with a

2.5-3 metre primary lead.

3.1 User Responsibility

This equipment will perform as per the information contained herein when installed, operated,

maintained and repaired in accordance with the instructions provided. This equipment must be

checked periodically. Defective equipment (including welding leads) should not be used. Parts that

are broken, missing, plainly worn, distorted or contaminated, should be replaced immediately. Should

such repairs or replacements become necessary, it is recommended that appropriately qualified

persons approved by CIGWELD carry out such repairs. Advice in this regard can be obtained by

contacting accredited CIGWELD Distributor.

This equipment or any of its parts should not be altered from standard specification without prior

written approval of CIGWELD. The user of this equipment shall have the sole responsibility for any

malfunction which results from improper use or unauthorised modification from standard

specification, faulty maintenance, damage or improper repair by anyone other than appropriately

qualified persons approved by CIGWELD.

3.2 Duty Cycle

Duty Cycle is the amount of arc-on time (actual welding or cutting time) during any 10 minute period

that a machine can operate at it’s rated output without damaging internal components. For example,

the Transtig 250Pi is designed for 40% duty cycle at 250 amps. This means that it has been designed

and built to provide the rated amperage, 250 amps, for 4 minutes out of every 10 minute period

(40% of 10 minutes is 4 minutes). During the other 6 minutes of the 10 minute period the Transtig

250Pi must idle and be allowed to cool. The thermal cut-out will operate if the duty cycle is

exceeded. As a general rule, a machine rated at more than 35% duty cycle would be more than

ample duty cycle for the majority of general-purpose non-automatic welding. Note that all duty

cycles are calculated for a maximum ambient temperature of 40°C as per IEC 60974-1. Duty cycles

must be reduced, ie reduce the arc-on time, when the ambient temperature exceeds 40°C.