Stresses concentration factor
The stress concentration factor gives the ratio of the maximum local stress at a notch to the nominal stress. It shows how much the stress varies in the weld.
Physicochemical Mechanism of Action
The stress arc describes how stress within a weld changes along its length. It is a measure of stress concentration at specific points, especially in cores or curvature points.
Metallurgical Relevance & Welding Risks
High stress arc can lead to local stress cracks and hot cracks. This occurs when the maximum local stress exceeds the material's limit for steel. A too high stress arc also increases the susceptibility to weld failure under mechanical loading.
Workshop Practice & Procedures
To ensure an optimal stress arc, pay attention to:
• Proper welding with sufficient filler material
• Good notch shape and spacing
• Controlled cooling steps to avoid rapid cooling
• Use of appropriate welding processes for specific applications