Overhead welding position
Overhead weld: Welding from below onto a horizontal surface. Short arc lengths and precise droplet detachment required due to opposing gravity.
Physicochemical Mechanism of Action
The overhead weld is performed from below onto a horizontal surface. Gravity acts opposite to the welding direction, causing droplets to easily run off and not stabilize. This requires short arc lengths and precise control of droplet detachment to ensure a uniform ratio between molten and solid material.
Metallurgical Relevance & Welding Risks
If arc length is insufficient or droplet control is lacking, the weld can be built up unevenly, leading to porosity and reduced mechanical properties. Additionally, gravity can cause hot cracking and distortion if not precisely controlled.
Workshop Practice & Action Guidelines
Use short arc lengths (approx. 1-2 mm) and ensure continuous droplet detachment. Keep the welding torch rigid and perpendicular to the surface. Set the temperature so that the material near the torch melts first to ensure even build-up. Monitor distortion and correct the travel direction or arc length as needed.