An Analytical Approach for Determination of Pre-Heat Temperature

A plethora of base materials with widely diverse chemical and mechanical properties find application in the fabrication of equipment for the chemical and process plant industries. The range is of a variety of ferrous alloys, non-ferrous metals and alloys. Present day concepts of fabrication of such equipment depend largely on the successful application of metal joining techniques. While non-ferrous metals and alloys are joined both by fusion and non-fusion processes, ferrous alloys are in general preferred to be joined by fusion welding. Some of these ferrous alloys pose considerable difficulties for making a satisfactory joint depending on their chemistry, design and thicknesses. An unsatisfactory joint would mean a disruption in the continuity of metallic structure of the element through the joint in the form of cracks and fissures, an unacceptable deviation of metallurgical and mechanical properties of the joined metals and surroundings or other surface or sub-surface irregularities, which may contribute to fracture or premature failure in service.