Afrox claims that ‘one of the most innovative recent developments to take place in the South African welding and cutting industry’ is the launch of its Lindoflamm® special torches and burners from parent company, The Linde Group.

A first for South Africa, the Lindoflamm® special torches and burners provide optimal heat transfer to the work piece, reducing gas consumption, improving productivity, quality and therefore total cost — as well as enhancing safety on the factory floor.

Afrox’s Johan Pieterse, Business Manager, Process Development, explains, “Our parent company’s research and development activities focus not only on improving existing customer processes, but also on completely new technologies. Lindoflamm is a perfect example of this, offering pre-heating, flame straightening and heat treatment solutions for manufacturers and fabricators working to the highest industry standards.”

Pre-heating with acetylene and compressed air,
Pieterse explains, is a critical requirement in the fabrication industry and plays a very important role in the integrity of the weld. It prevents failures such as hydrogen-induced cracking, as well as common failures in the heat-affected zone. An increasing number of fine-grained structural steels are being used for the construction of structures, apparatus, and equipment – increasing the importance of pre-heating prior to welding.

Lindoflamm® technology offers the fabricator a number of advantages that improve quality, productivity, safety and reduced process costs. An important characteristic of acetylene is the high heat intensity in the primary flame. This results in a focused flame, pre-heating only in the weld area, increasing the speed at which the weld area is heated as much as a two thirds faster than other fuel gases, and could save as much as 32% on total process cost. Working conditions are also improved, since less heat is reflected, improving operator comfort. Due to this reduction in heat reflection, gas consumption is much lower.

Another important characteristic is lower water content (4%), compared to as much as 30% in other fuel gases, which reduces the risk of inducing hydrogen in the weld area and is an important factor in quality enhancement.

The mixture of compressed air and acetylene, coupled with the focused flame, reduces the risk of surface damage. Acetylene is also less dense than air, compared to other fuel gases that are denser than air, reducing the risk of accidents and incidents when working in confined spaces.

“This is the safest solution,” concludes Pieterse. “Lindoflamm torches, burners and nozzles are all application-specific designs, ensuring that particular needs are met.”