Comparsion Of Oxyfuel-gas Welding And Pressure-gas Welding

Welding process is a tool of hand can be used to connect and attach two or more metals together through a specific process to accomplish. This process can be performed with a lot of methods, fits the situation as it needs. Herein below the discussion of Oxyfuel-Gas and Pressure-Gas Welding process which will be in details, to get to know how it perform and each one’s strengths and weaknesses to decide which one to use and when.

The process of using Oxyfuel-Gas Welding has been established from a long time ago, maybe more than 200 years. The mechanism of using this method were developed and achieved during the time period of 1900 almost, at least the production of oxygen and later has dissolving it, besides, the torch or gas fuel welding such as gasoline or acetylene has been developed and perfected as well in the late 1887. so the long history of using this method, the long experience and upgrading took a place to achieve it. To get to know the elements and units of the Oxy-Gas welding equipment, then it will be as, Two Cylinders of Oxygen and Fuel Gas such as Gasoline and or Acetylene, Regulators to control the feeding pressure between the Cylinders and Hoses attached to it, transferable hoses to the torch nozzles, regulators on the torch controller to adjust the heat used for welding and finally a Filler to be used as an additional metal for the melted materials from both edges needed to welded, sometimes fillers are not used in welding process.

The process of using gas welding can be either with Gasoline or Acetylene, as each one differs in usage setup and storage procedures. Likely the Acetylene is more concerned in welding in usage than the Gasoline due to many effective factors in the field. The process in this method starts by adjusting the regulators to equalize the pressure between the cylinders and the hoses to give the best feeding of it, then by the torch nozzle regulators, the pressure must be adjusted to be able to give the best heat discharge to the attached metals, once start applying it, the meltdown begins, and whether the operator is going to use a filler materials or not, at the end it depends on the quality and the output needed for welding operation. The strengths of using this method is it has simple equipment, it can be portable, cheap to use and easy in repair and maintenance. The weaknesses are, it is not worth the welding production rates, the speed of welding take much time, the heat generated is higher than other methods and yet cannot achieve what those methods can do.

Pressure Gas-Welding process has the same equipment setup like the Oxyfuel-Gas welding, except for the torch nozzle as it is shaped like semi-closed arc to surround the targeted welding spot, this process is mainly used in open field projects such as construction sites and preferably the wide open workshops, and without filler this time as this method depends on pressurizing the metals onto each other while melting process in progress. And to get close to it, the process mechanism is, to Heat the cross section of each metal together as “Face to Face” through the torch nozzle in the middle, then the heat ignites between them, then the meltdown starts. On this step, the pressure on both metals starts in a range to be able to create the welded joints from both ends and with considering the overlapping between both to create a strong joint at the end. To get to the strengths, this method has a flexibility to move from a place to another, that’s why it is preferred in open fields, the usage is simple and also with low quality end and this is reflected to the cost as well. The weaknesses on using this method is, it cannot be used on the very thin materials, beside it not suited for the rapid production, and finally due to not having filler to mix with the pressurized welding process, then the strength will be low.

In the end, we consider that the setup for each one has its strengths and weaknesses, such as having the workflow demand in hand and the cost on the other hand, to know which method suits the best for usage in the operation.

References

• Hobart Institute of Welding Technology, Modern Welding Technology, 4th. Edition, 1998
• Perrry, Doug, What is the difference between gas welding and braze welding, 2020
• Kristoff, Susan, Types of Gas Welding, March, 2018
• Singh, Rakesh, Gas Welding Process, November 2013
• Dilshan, Lahiru, Pressure Gas Welding Process, Mechanical Engineering, University of Moratuwa, March 2018