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Tube Düsseldorf Tradeshow 2018

23 March, 18 3:08 pm · Leave a comment · reddarc
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Red-D-Arc will be exhibiting at Tube Düsseldorf trade show in April. Be sure to drop by booth 6F23 in Hall 6 to view our latest pipe welding and cutting equipment.

Tube Dusseldorf Tradeshow Announcement

Red-D-Arc offers a comprehensive selection of pipe welding equipment for rent.

Preheating-Weldments

21 March, 18 6:14 pm · Leave a comment · reddarc
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Importance of Preheating in Welding – Equipment Options

Induction Heating Pipe

Why preheat?

Preheating reduces the risk of cracking in weld metal and heat-affected zone (HAZ) by:

  • Lowering the cooling rate of the weld – prevents formation of brittle weld metal/HAZ, allows more time for hydrogen to escape the molten weld.
  • Removing moisture (hydrogen source) from the part.
  • Reducing shrinkage by lowering the temperature differential.

Preheat or not?

The requirement and level of preheating for steel is determined by the relevant welding code and is dependent on the weld heat input, chemical composition of steel (carbon equivalent), thicknesses, diffusible hydrogen etc. Non-ferrous materials generally require preheat because of their high thermal conductivity.

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