Range of Qualification for WPQR
The WPQR range of qualification defines the tolerances and parameters within which a successful welding test is valid. A retest will only be required outside this range.
Physicochemical Mechanism of Action
The WPQR range of qualification specifies which deviations in materials, welding parameters, and environmental conditions can be tolerated without affecting the quality of the weld.
Metallurgical Relevance & Risks in Welding
If actual values fall outside the WPQR range of qualification, quality issues can arise, such as insufficient weld volume, lack of hardness, or increased susceptibility to cracking. This can lead to production disruptions and additional costs.
Workshop Practice & Action Instructions
To ensure the WPQR range of qualification is maintained, welding parameters must be precisely measured and controlled. This includes monitoring temperature, voltage, time, and the use of the correct filler material. If deviations fall outside the defined range, a retest is required.