Breadcrumb Home Welding Technology WT 201 WT 201: Weldability of Metals [RE] Program Welding Technology Credits 5 This course introduces the concepts that explain the metallurgical behavior and determine the weldability of ferrous and non-ferrous metals. Restricted Elective Prerequisite Completion of WT 108, 141, and 181, all with a 0.7 or higher.