KEMPPI Kempotig ACDC 250 TIG-welder 


Read carefully these instruction before you use the welding machine!

Operation control and connectors

1/0 Signal lamp
Signal lamp for basic current

Signal lamp for up-slope
Signal lamp for welding current
Signal lamp for pause basic current
Signal lamp for down-slope
Post gas time control
Basic current control
Up-slope control
Down-slope control
Control for spot welding time
1/0 Switch
Selecting switch for Minilog
Control voltage connection
Connector of remote control
Control connection, welding torch
Gas-/welding current connection, welding torch
Liquid-/welding current connection, welding torch
Connection of return cable

Welding voltage connection, positive
Welding voltage connection, negative
Cooling liquid connection, welding
Cooling liquid connection, supply
Cooling liquid connection, return
Connection for shielding gas, supply
Welding current cable, positive
Welding current cable, negative
Cooling liquid hose, return
Cooling liquid hose, supply
Control cable
Control cable
Shielding gas hose
Mains cable for WU
TIG-torch, gas-cooled
TIG-torch, liquid-cooled
Retur cable
Interconnection cable for remote control
Interconnection cable for remote control
Delivery as interconnection cable bundle


Never watch the arc without a face shield designed for arc welding!
The arc damages unprotected eyes!
The arc burns unprotected skin!
Be careful for reflecting radiation of arc!
Protect yourself and the surroundings against the arc and hot spray!
Don’t use power source for melting of frozen pipes!
Remember general fire safety!
Pay attention to the fire safety regulations. Welding is always classified as a fire risk operation.
Welding where there is flammable or explosive material is strictly forbidden.
If it is essential to weld in such an area remove inflammable material from the immediate vicinity of the welding site.
Fire extinguishers must always be on site where welding is taking place.
Note! Sparks may cause fire many hours after completion of welding.
Watch out for the mains voltage!
Take care of the cables – the connection cable must not be compressed, touch sharp edges or hot work pieces.
Faulty cables are always a fire risk and highly dangerous.
Do not locate the welding machine on wet surfaces.
Do not take the welding machine inside the work piece (i.E. In containers, cars etc.)
Ensure that neither you nor gas bottles or electrical equipment are in contact with live wires or connections!
Do not use faulty welding cables.
Isolate yourself by using dry and not worn out protective clothes.
Do not weld on wet ground.
Do not place the TIG torch or the welding cables on the power source or other electrical equipment.
Be careful of TIG ignition pulse voltage!
Don’t press on torch switch, if the torch is not directed towards work piece.
Don’t use wet TIG torch.
Do not use damaged TIG torch.
Watch out for the welding fumes!
Ensure that there is sufficient ventilation.
Follow special safety precautions when you weld metals which contain lead, cadmium, zinc, mercury or beryllium.
Note the danger caused by special welding jobs!
Watch out for the fire and explosion danger when welding container type work pieces.


KEMPPI Oy provides a guarantee for products manufactured and sold by them if defects in manufacture and materials occur. Guarantee repairs must be carried out only by an Authorized KEMPPI Service Agent. Packing, freight and insurance costs to be paid by third party. The guarantee is effected on the day of purchase. Verbal promises which do not comply with the terms of guarantee are not binding on guarantor.

Limitations on guarantee

The following conditions are not covered under terms of guarantee: defects due to natural wear and tear, non-compliance with operating and maintenance instructions, connection to incorrect or faulty supply voltage (including voltage surges outside equipment spec.), incorrect gas pressure, overloading, transport or storage damage, fire or damage due to natural causes i.e. lighting or flooding.
This guarantee does not cover direct or indirect travelling costs, daily allowances or accommodation.
Note: Under the terms of the guarantee, welding torches and their consumables, feed, drive rollers and feeder guide tubes are not covered. Direct or indirect damage due to a defective product is not covered under the guarantee. The guarantee is void if changes are made to the product without approval of the manufacturer, or if repairs are carried out using non-approved spare parts.
The guarantee is also void if repairs are carried out by non-authorised agents.

Guarantee period

The guarantee is valid for one year from date of purchase, provided that the machine is used for single-shift operation.
The guarantee period for double and treble shift operation is six months and four months respectively.

Undertaking guarantee repairs

Guarantee defects must be informed to KEMPPI or authorised KEMPPl Service Agents within the guarantee period.
Before any guarantee work is undertaken, the customer must provide proof of purchase and serial number of the equipment in order to validate the guarantee.
The parts replaced under the terms of guarantee remain the property of KEMPPI.
Following the guarantee repair, the guarantee of the machine or equipment, repaired or replaced, will be continued to the end of the original guarantee period.


Kempotig 50 is AC/DC-TIG ignition and control unit. It includes connections for gas- as well as water-cooled torches.
Kempotig 50 unit has versatile operation ways. Among others stepless remote control of welding current with up- and down slope, Minilog-function as well as time control of shielding gas use enable even the most demanding welds.


Kempotig 50

Working voltage *) 30 V 50/60 Hz
Rated power 35 VA
Load capacity                     ED   60% ED 100 % 500 A
387 A
Dimension                           length width height 400 mm
215 mm
400 mm
Weight 16 kg
Degree of protection IP 23
  • Note! Supply through safety isolating transformer.

The products meet conformity requirements for CE marking


Main switch
  • in the O-position of the switch, the power source is directly controlled by the local- or remote control
  • in the I-position of the switch the ignition and control circuits of the Kempotig 50 are switched on.

Welding and pulse current: remote control devices from C-series.

Basic current control                          1 – 10

Up-slope control                                  0 – 5 s

Down-slope control                            0 – 10 s

Spot welding time control                 0 – 2 s

Potentiometer for post gas time 5 -30 s (Automatically controlled gas valve.)

Torch switch:

  • long signal > 0,7
  • short signal < 0,7 s

Selecting switch of control method:

  • continuous welding
  • spot welding
  • Minilog control


Continuous welding

Immediately the torch switch is depressed the gas flow begins and the ignition pulse is developed. When the weld­ing arc is established the welding current increases to a value set by the remote control at a uniform rate, depend­ent upon the adjusted up-slope time.
If the arc does not ignite, the switch must be released and depressed again.
When the switch is released the welding current decreases to zero at a uniform rate dependent upon the adjusted down-slope time after which the adjusted post gas flow time begins.

Spot welding

The operation is similar with the continuous welding but the spot time from beginning of up-slope to beginning of down-slope can be adjusted.
The adjusted time for post gas flow begins when the spot time is at the end and the switch released.

Minilog control

The Minilog programmed is controlled by signals from the torch switch given by the operator. The signals are termed a “short signal” and a “long signal”.
When the torch switch is depressed gas flow begins. Af­ter the long signal time has elapsed the torch switch can be released, ignition pulses are then developed and a welding arc is established at a current level dependent upon the basic current potentiometer setting.
A short signal is then required to slope up the adjusted welding current, determined by the remote control.
The current is changed by means of further short signals between welding current and basic current settings.
To end the welding operation a long signal must be given after which the current decreases to zero from the weld­ing or basic current level over the adjusted down slope time. The adjusted post gas flow time then begins.
It is possible to check the sequence of operations of the Minilog programmed, with the LED lamps fitted to the facia panel of the Kempotig 50 unit.

Long pulse

Welding current can be pulsed with  the control  device C 100P.
The pulsing also operates during down-slope, however not when finishing from the basic current.


The amount of use and the working conditions should be taken into consideration in the maintenance of the Kem­potig 50 equipment. Careful use and preventive mainte­nance will ensure trouble free operation without unforesee­ able service interruptions. The unit can be placed independently or on the transport trolley of the MULTISYSTEM.
In order to reduce the dust disturbances we recommend the siting height about 70 cm from the floor.
The unit should be protected against hard rain.
The dust from inside the unit can be blown out with dry compressed air.
The connectors should be tightened at regular intervals.
When cleaning with dry compressed air, always por­tect your eyes with proper eye protection!
In case of porblems contact the KEMPPI works or your KEMPPl-dealer.

Documents / Resources

KEMPPI Kempotig AC/DC 250 TIG-welder [pdf] Instruction Manual
Kempotig AC DC 250 TIG-welder, Kempotig, AC DC 250 TIG-welder, TIG-welder, welder

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