Some Facts Keep You Mind While Adopting a Welding Machine

For striking a welding arc it is vital to have the preferred cutting-edge in the welding circuit. Depending upon the type of cutting-edge required (ac or dc) it may be received from the following resources.
A welding machine or frequency changer (for arc welding gadget).
The no load or open circuit voltage (OCV) ought to be high sufficient to strike an arc, but now not so high as to endanger the welding operator, for example, for a 2000A transformer the OCV need to no longer be over ninety volts through for decrease currents of say upto 600A OCV may be up to one hundred volts.


With direct modern-day, the OCV should be at the least 30 to 35 volts at the same time as with alternating present day it must no longer be decrease than 50 to 55 volts. An open welding arc can be sustained at 18 to forty volts.
The minimum voltage for arc ignition is 25 volts which need to be attained inside 0.05 2nd for the upkeep of a strong arc.
The strength of the welding supply ought to be sufficient to provide the specified welding contemporary.
It must be feasible to faucet the preferred current in the available limits either in endless steps 9stepless regulation) or in a big range of discreet steps (stepped regulation).
The voltage of the electricity supply must regulate itself hastily with the alternate in arc duration.


Volt-Ampere Characteristics of a Welding Power Source
All welding electricity assets have types of working traits viz., static feature and dynamic characteristic. The static output feature can be without difficulty mounted by means of measuring the constant-nation output voltage and cutting-edge via traditional approach of loading by using variable resistors. Thus, a curve showing the output current as opposed to output voltage for a given electricity source constitutes its static function.


The dynamic function of an arc welding power source is determined with the aid of recording the brief versions going on over a quick periods within the welding modern and the arc voltage. Thus, it describes instant variations occurring over a quick c programming language of time say a millisecond. Arc balance is decided with the aid of the mixed interplay of the static and dynamic colt ampere (V-I) characteristics of the welding machine energy supply.


The intrinsic temporary nature of a spot welding machine is the principle cause for super importance of the dynamic characteristics of an arc welding electricity supply. Most welding arcs have continuously changing conditions that are specially related to striking of the arc, metal switch from the electrode to the weld pool, and arc extinction and resignation at some point of each half cycle of arc welding.

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