Heat-Affected Zone Longitudinal Crack
Longitudinal cracks form parallel to the weld in the heat-affected zone due to thermal stresses and embrittlement. They can lead to component failure.
Physicochemical Mechanism of Action
Longitudinal cracks form when the metal near the weld is strongly contracted during fast temperature changes. This creates internal stresses that trigger embrittlement and can destroy the structure.
Metallurgical Relevance & Welding Risks
Longitudinal cracks can destroy parts, especially when they hit load-bearing sections. They worsen the mechanical properties and lead to cracks or wear problems.
Workshop Practice & Instructions
Avoid longitudinal cracks by cooling the weld in a controlled way. Use suitable filler material and protect the surroundings from fast temperature swings. Keep the welding parameters (temperature, time) exactly. For large parts, a check after welding makes sense.