The transformer in welding machine is a step-down transformer, often referred to as a welding transformer. In this post, Partopia Transformer, a professional weding machine transformer manufacturer & supplier, will break down how it works, what it looks like, and how it’s used.
Custom Welding Machine Transformers
Custom Power Transformers
1.Principle of welding machine power transformers – Lower voltage, raise current
Power conservation:
Power equals voltage times current. Welding machines require only 15 V–40 V, while the main supply is typically 110 V, 220 V, or even 440 V. A step-down transformer drops the voltage and the current to several hundred amperes, preserving power.
How it runs:
The welding machine transformer functions only with alternating current (AC), because a changing magnetic flux is needed to induce voltage in the secondary winding. In welding machines, a rectifier follows the transformer to convert the AC into direct current (DC) for the welding arc.
2.Structure of welding machine electrical transformers – Core and primary/secondary windings
Core:
The core is usually a rectangular laminated steel core designed to minimize eddy-current losses.
Primary winding:
it contains many turns and connects to the mains side (wall power).
Secondary winding:
it contains fewer turns, leading to a low-voltage, high-current output. The fact that the primary has more turns than the secondary is what makes it a step‑down transformer.
3.Practical Application – Power system of a welding machine
From the wall to the transformer:
It drops the 110/220/440 V down to about 15 – 40 V.
From the transformer to the rectifier:
The rectifier turns that AC into DC, which powers the welding arc (SMAW, GMAW, TIG, etc.).
Advantages:
Reliability: can push a big welding current without any fancy tricks.
High power capability: Provides high welding current at the same power level.
Cost-effective: Cheaper to manufacture than modern inverter-type welders.
4.Summary
Type:
The transformer inside a welding machine is a step-down transformer.
Function:
Takes the high voltage from the wall, drops it down, and pushes the current up to a few hundred amps.
Construction:
A rectangular laminated core with a high-turn primary winding and a low-turn secondary winding.
Integration:
After the transformer, a rectifier turns the AC into DC, giving you the power you need for the welding arc.
If you intend to customize welding machine transformers in bulk for your welding machine production, feel free to contact Partopia Transformer! We’ll provide high quality electrical power transformers that best suit your needs.
