Metal Preheating in the welding process is required to help ensure weld quality, and to reduce to a minimum the occurrence of cracking which may lead to rework at a very high cost.

Metal Preheating in the welding process is required to help ensure weld quality, and to reduce to a minimum the occurrence of cracking which may lead to rework at a very high cost. The preheat weld process is often required for steel components of thickness over 25 mm (1 inch) or steel parts subjected to high mechanical stress like power plants, shipbuilding, windmill towers, oil and gas pipelines, and heavy equipment applications.

 

 

Many companies using the Preheating process are using fossil fuel to do the work and they aren’t aware of the high costs and the inefficiency (approximately 30-45% efficiency) of such energy source.

 

 

Comaintel’s technology can replace fossil fuel (or electrical resistance mat) preheating process by a clean and no-contact energy source (induction heating using electricity). With an energy efficiency of 90-95%, it is the most reliable, economical and clean energy you can use to perform the Preheating process before welding.

Comaintel conducted many tests that clearly show how we can replace Natural Gas (or propane gas) for preheating tower cans (see pictures) using our Induction Systems.

Here are some of the benefits you can expect using our technology:

  • Reduced preheating time by 60%:
    • Example: Structure diameter 4,3 meters (14’ 1”) with 40 mm (1,5”) wall thickness with targeted preheating temperature(from 70°F to 150°F);
    • It took 24 minutes instead of 60 minutes for natural gas 1,400,000 BTU torch);
  • Reduced energy costs dramatically because of high efficiency of induction heating;
  • Induction preheating will lower Greenhouse Gas significantly;
  • Improves working environment and reduce potential work incidents (no flame);
  • A very quick Return On Investment (ROI) and a much more efficient system;
  • More induction coils can be added to reduce even more the preheating process (usually linear: if it takes 24 minutes with two 6 kW induction coils, it will take roughly 12 minutes with four 6 kW induction coils)

 

 

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Metal Preheating

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