Production Weld Test
A work sample is a test weld under actual production conditions. It shows the actual weld quality and reveals structural defects such as hardening cracks or porosity. It serves as evidence for particularly demanding parts.
Physical-Chemical Working Mechanism
The test sample uses the same welding parameters as the actual production. Same base material, same filler metal, same heat input, and same cooling conditions produce the identical weld structure. Only this way can defects in the weld zone be realistically detected. The sample is a mirror image of the later component weld.
Metallurgical Relevance & Risks in Welding
If the test sample deviates from the actual conditions, it loses its validity. Too low heat input leads to rapid cooling and hard martensite. Too high heat input causes grain growth and reduces toughness. Incorrectly welded test samples fake good quality and endanger the component.
Workshop Practice & Action Instructions
Always weld the test sample with the same parameters as the component. This includes welding current, voltage, speed, preheat temperature, and interpass temperature. Keep the heat input within a tolerance of ±10 % of the set value. Examine the sample according to the applicable standard, for example, by visual inspection and destructive testing. If the sample deviates, correct the welding procedure immediately.