Flexible induction coil

for pre-heating before welding

During steel welding, the hardness of the heat-affected zone will increase. Hardness tends to have a negative impact on welding quality. Hardness increases quickly with temperature difference that is between the areas beside the seam and the seam itself. So welding parts need to be heated to minimize hardness intensity. The temperature that will help avoid cold cracks depends on thickness of the work pieces, heat dissipation, alloy material and heat treatment during the welding. Leifert Induction has developed a flexible, air cooled induction coil for preheating of welding seams. This is a special new tool in the area of welding. It has good mechanical features and is fireproof.