PREHEATING

_IXAR specializes in local Post weld heat treatment of carbon steel and alloy steel piping welds by means of the electrical resistance method, in the form of ceramic heater pads and by using electricity as source of heating for stress relieving of weld joints. All heat treatment services are designed to minimize downtime, improve structural integrity, and enhance effective plant life. Additionally, depending on the mobility of the required equipment many of our heating processes can be applied on-site or at your facility.

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_Preheating involves rising the temperature of the parent material locally, on both sides of the joint to a value above ambient. The need for preheat is usually determined by the pertinent fabrication code and verified by the weld procedure qualification test. Preheat may be required as an aid to welding for one of the four basic reasons:

    _To control the rate of cooling, _To control the diffusion rate of hydrogen in a welded joint, _To reduce thermal stresses,
Compensation for heat loss.