Backstep welding technique
Back-step welding technique reduces thermal longitudinal expansion through short segments in the opposite direction. This prevents stresses and cracks in the component.
Physical-chemical mechanism of action
Step-back welding works with short weld segments executed in the opposite direction to the overall travel direction. This minimizes the thermal longitudinal expansion of the part because each weld operation only heats and cools a small area.
Metallurgical relevance & risks in welding
Reducing thermal longitudinal expansion prevents stresses in the part that could lead to cracking. However, incorrect application or segments that are too short can result in incomplete fusion or lack of density.
Workshop practice & instructions
For optimal results, use weld segments of 10 to 20 mm in length. The overall travel direction should be consistent, and the spacing between segments should be at least 5 mm. Ensure uniform heating and cooling to minimize stresses.