ISO Welding Standards: System and Personnel Logic
What the candidate must understand
ISO welding standards form a system rather than a single code. Candidates should understand the roles of ISO 3834 (quality requirements for welding fabrication), ISO 9606 (qualification testing of welders), ISO 15614 (procedure qualification by testing), and ISO 14731 (welding coordination tasks and responsibilities). Know that ISO 9606 qualifications specify ranges of approval for material group, thickness, position, and process, and that ISO 15614 defines procedure qualification tests. Understand the concept of the responsible welding coordinator and how the quality system ties procedures, personnel, and inspection together.
Traps in questions
A common trap is treating ISO 9606 as a procedure qualification; it qualifies the welder. Another is assuming a welder qualification is unlimited in thickness or position; ranges of approval apply. Watch for questions on who may perform welding coordination and whether ISO 3834 is a product standard; it is a quality-system standard. Answers that import ASME or AWS logic directly are often wrong.
Worked example / rule of thumb
Rule of thumb: 9606 is the person, 15614 is the procedure, 3834 is the system. Worked example: a stem asks which standard supports a welder moving to a thicker plate. The correct reasoning is to check the range of approval in the welder's ISO 9606 qualification; if the new thickness exceeds it, requalification is needed. The procedure standard does not answer that question.
Study approach
Build a four-row table for 3834, 9606, 15614, and 14731, and note what each controls. Then practice assigning each scenario to the right standard.