Welder Training & Testing Institute is a private welding school in Allentown, Pennsylvania, operating since 1968. Its primary career-level offering is the 900-hour Welder Fitter diploma for students with little or no welding experience. WTTI also offers certificate courses in Stick, advanced pipe, TIG, MIG, and Flux-Core welding. Training includes plate and pipe work, metal cutting, structural layout and fitting, fabrication, multiple welding positions, and optional qualification testing through the school's AWS Accredited Test Facility and ISO 17025 laboratory. Full-time and part-time schedules are available.