CSWIP 3.1 – Welding Inspector Certification Course The CSWIP 3.1 Welding Inspector Certification is an internationally recognized qualification awarded by TWI (The Welding Institute, UK). This course is designed for professionals who want to build or upgrade a career in welding inspection, QA/QC, fabrication, construction, oil & gas, power plants, shipyards, and heavy engineering industries in India and abroad.