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LPG for Metal Preheating

LPG for Metal Preheating

What is preheating & why is it done? 

When welding, brazing, or soldering metals like Steel, Aluminium, Inconel, chrome steel, and other ferrous or nonferrous alloys, joint failures and other defects can occur thanks to the acute thermal stresses imposed by rapid heating and cooling at the connection area. Preheating the connection area is done to prepare the surfaces better and slow the cooling process to reduce the potential for joint failure. It also drives out moisture which can also cause problems. As a result, there's less rework required, and therefore the finished piece performs better. 

A crucial step in many welding applications, preheating slows the cooling rate during a finished weld, lowers the quantity of hydrogen in it and reduces the danger of cracking. Artificially introducing heat into the bottom metal — through an external heat source — adds a step to the welding process; however, it can save time and money in the long term by reducing the potential for a failed weld. 

Using liquid fuels is one of the industry-standard methods for all the Industrial Thermal Cutting Processes, but when Propane (LPG) was introduced to the market, the whole thermal cutting process changed, and the battle between Propane (LPG) and the other fuels was born. 

With the right parts, setup and knowledge, LPG could match up or perform better than acetylene. In the welding industry, LPG is used for the vast majority of preheating. 

Advantages of using LPG: 

  • i) It has more excellent total heat combustion 

  • ii) It is easy to get and is economical 

  • iii) It is more stable 

  • iv) It provides uniform heating and better-quality end product. 

Why opt for the condescending grade LPG of SUPERGAS? 

The power of SUPERGAS LPG can fuel your life—in your factory, around your yard, and on the go! 

Call us at 9121177930 or send your queries to Be rest assured that our experts will address your fuel requirements at the earliest!