IXAR specializes in local Pre-Weld Heat Treatment of carbon steel and alloy steel piping welds by means of electrical resistance method, in the form of ceramic heater pads and by using source of 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.
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; 1) To control the rate of cooling. 2) To control the diffusion rate of hydrogen in a welded joint. 3) To reduce the thermal stresses. 4) Compensation for heat loss.