Welder Training & Testing Institute has supported the welding industry's demands since 1968. LAB TESTING and CERTIFICATION - WTTI operates in-house mechanical and nondestructive testing laboratories to perform procedure and welder qualification and material testing through our ISO 17025 accredited test lab and AWS Accredited Test Facility. WELD COUPONS - WTTI stocks plate and pipe coupons prepped per various code requirements and marked with mill heat numbers. INSPECTION - Our qualified inspectors use NDT methods to test your products at your site or our facility. (less)