What is oxyacetylene welding?

July 18,2022

Oxyacetylene welding represents the welding technique in which the energy is produced by combustion in equal parts of acetylene and oxygen.


This methodology, discovered in 1895, was the most used during the first decades of the twentieth century, before being replaced by other more innovative technologies, such as arc welding. However, even today, it is widely used in some workshops and for welding in points where it is not possible to have electric power.


oxyacetylene welding


Principle of operation of the pressure regulators


This component is divided into two chambers: a low pressure chamber and a high pressure chamber. When the gas tap is opened on the torch, a depression is generated which causes the membrane to flex under the effect of the spring. This determines the opening and the communication between the two chambers, generating the escape of the gas from the high pressure chamber towards the low pressure one. With the closure, the procedure is the opposite, with the pressure that determines the return of the membrane in its initial position and the interruption of the inflow of gas from the high pressure chamber towards the one with a lower pressure.


What are the features of pressure regulators?


Pressure regulators play a fundamental role in the equipment for oxyacetylene welding. The most important features of these elements are:


  1. First of all supply a constant pressure and, in general, lower than that of the cylinders of origin of the two gases concerned.
  2. Allow the regulation of the pressure to the values of interest for carrying out the operation.
  3. To guarantee a certain level of security.


The pressure regulators or reducers are also anticipated and followed by two pressure gauges which respectively measure the pressure in the cylinders and the pressure at the outlet of the regulator. The reference standard for the realization of these elements is the UNI EN ISO 2503 standard: "Pressure reducers for gas cylinders used in welding, cutting and related processes up to 300 bar".