Weld January 31, 2020
welding

 

POWER SOURCE IN ARC WELDING

The purpose of this article “Power source in the arc” is to be a guide for understanding and selecting the appropriate power source.

 

INTRODUCTION

Several types of power sources are used to meet the requirements of various arc welding processes, including all types of arc welding processes which will be described below.
 The purpose of this article is only to understand the proper power source for arc welding processes.

SELECTION  OF POWER SOURCETRANSFORMER TYPE POWER SOURCES

This is very important for the selection of a power source that must be related to the specific welding process. The initial stage of the selection process is to expand the arc welding process requirements.
 There should be a process for designing the arc welding power source. An arc welding power source usually designed to convert high voltage to low voltage and low amperage current to high (about 50 to100 volts) and heavy current that can be above 500 amperes.

THE FACTORS INFLUENCE

The selection of the power source

Some of these factors should be considered, when selecting a power source like:-, available power, power requirements in future, maintenance, economic considerations, portability, environment, available space, requirements of the safety factor, the performance of the manufacturer, service availability, and standardization, initial cost, and running costs, duty cycle, required production and efficiency will have an effect on the final selection of a particular power source.

CHARACTERISTICS

Some characteristics of arc welding power sources must be according to one or more of the following characteristics depending on the specific output.

A power source AC., DC. or both can give. It may also have the characteristic of providing constant current or voltage. In relation to the input.

A power source may derive its power from utility lines or from a prime mover such as a combustion engine or transformer or motor-generator types.
It is notable that straight lines, connections to primary utility, do not provide current and voltage suitable for arc welding requirements.


DESCRIPTION OF A POWER SOURCE

The description of the power source should include identification under each of these categories, such as: In some processes, like GTW.

The power source is “a transformer-rectifier with a constant current.  Welding current rating, service classification, and power line requirements should also be included in the description.

TRANSFORMER TYPE POWER SOURCES

A transformer-type power source will only provide alternating current where the transformer-rectifier power source can provide both AC and DC supplies. Basically, transformers occupy less floor area than a generator engine. …

To be continued…