Coded Welding South Africa: The Complete Cape Town Guide to Becoming a Coded Welder Quick Answer: What Is Coded Welding? The Simple Answer Before You Waste Money on the Wrong Course Coded welding means welding that is performed and tested according to a specific welding code, standard, procedure or specification. A coded welder is a welder who has passed a practical test proving that they can produce welds that meet a required standard, procedure, process, material type, join