Back gouging groove profile
Backing groove is a welding technique where the workpiece is held under pressure in a liquid medium (e.g., water) before welding. This prevents distortion and ensures precise execution.
Physical-Chemical Mechanism of Action
The backing groove uses hydrostatic pressure to stabilize the workpiece. The water in the molten or liquid state acts as a stress carrier and prevents distortions due to thermal expansion.
Metallurgical Relevance & Welding Risks
This technique is especially important for heavy, thin workpieces or under high stress conditions. Improper execution can lead to uneven stresses and affect the structure, which can cause cracks or breakage.
Shop Practice & Instructions
To successfully perform the backing groove, the workpiece must be held under pressure in a closed container. The pressure should be set to compensate for distortions. Temperature and pressure must be precisely controlled to ensure a homogeneous weld seam.