1T AND 2T FUNCTION

1t refers to the action of the torch trigger, ie press in weld function on. Release trigger weld function off.

4t means press trigger in weld function on, release trigger weld function remains on. Press trigger again and weld function is off. Often used in motorised travel or semi robotic welding.

Thanks Garth. Could I tell 1T is manual type and 4T is automatic type?

Let me know the most suitable function for 1T. Is it in spot welding?

Thks and Rgds,

Kotuu2.

No it is not relevant to spot welding.

4T is not strictly automatic, beware the use of the word automatic MIG welders are generally refered to as automatic machines but are manually operated and can be installed in fully computerised operating systems also, the terms can be mixed and confusing sometimes.

I am afraid I have misled you in my previous reply I should have referenced your query of 1t as being actually 2t. So read [1t as 2t] and 4t and are trigger actions used in MIG & TIG welding as explained before.

Garth..

I would like to express my thanks to you,Garth.

I am now clear enough for 2T and 4T trigger actions. These trigger pulses are controlled by PWM signal in the control circuit pcb, aren't they?

Kindly let me know your point of view on the circuitary.

kotuu2.

No 2T and 4T are operator functions which start or stop the electrical operations of the welder.

Your PWM is used to control power output via MOSFETs or IGBTs the triggering of which is controlled by presets and power output feedback . Or in the case of SCRs by phase control. All of the above can be combined in one welder to give control to background current and pulse welding power or AC/DC in various combinations.

Are you sure you don't mean T1 and T2

T1 and T2 refer to the thickness of each part.

Branson