The Importance of Contact Tip to Work Distance in GMAW

If you look at any of the structural welding codes you’ll notice that contact-tip-to-work-distance (CTTWD) is a variable which must be listed in welding procedure specifications (WPSs).  However, it is not an essential variable, meaning that changes to CTTWD of any amount do not require requalification.   This can seem puzzling to some, especially those […]

14 Welding Procedure Specification Variables

A Welding Procedure Specification has several variables which should be carefully specified.  The values selected for the variables discussed below have a significant impact on weld soundness and mechanical properties. It is critical that these values be appropriate for the specific requirements of applicable code and job specifications.  Some of the most important variables in […]