Welded Ring Offset Welding for Uniform Seam Quality
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Solution Overview
Problem
Existing methods for producing welded rings often result in non-uniform weld seams, leading to reduced welding quality, especially in the overlapping region, and are inflexible in accommodating different diameters and production volumes.
Innovation Solution
Introducing an offset in the circumferential direction of the ring ends and welding from both sides inwards towards the offset to create a flush weld, which reduces the melt flow issue and enhances welding quality in the overlap area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If welding is performed from one side only, then the welding process is simple, but the weld seam uniformity deteriorates due to melt flowing away in the centre
Solution Approach 1:
The welding process is segmented into two separate welding operations performed from opposite sides of the ring. The first weld seam is created from one side and the second weld seam from the other side, with both seams meeting at the offset position. This segmentation allows each weld to be controlled independently, preventing melt accumulation in the centre and ensuring uniform weld seams throughout the ring.
Solution Approach 2:
The offset in the circumferential direction creates a spatial dimension that separates the weld puddles. By positioning the offset away from the centreline, the two weld seams approach each other in a controlled manner from opposite sides, eliminating the harmful convergence of melt in the centre while maintaining process simplicity.
2Shape
If no offset is provided at band ends, then the band ends align perfectly, but double weld puddles form in the overlapping region reducing welding quality
Solution Approach 1:
An asymmetric offset is introduced at the band ends, positioned at approximately 45 degrees to the band edges. This asymmetric positioning ensures that the offset is equidistant from both edges, allowing the two weld seams to meet cleanly at the offset position without creating double weld puddles. The asymmetry breaks the symmetry of the problem that causes melt accumulation in the overlapping region.
Solution Approach 2:
The offset is pre-positioned at the band ends before welding begins. This preliminary geometric feature guides the welding process by defining the exact point where the two weld seams should meet, preventing the formation of double weld puddles and ensuring consistent weld quality throughout the ring.
3Productivity
If fixed production volumes are used, then production efficiency is high, but flexibility for different diameters is reduced
Solution Approach 1:
The welding method with offset and two-sided welding is universally applicable to rings of different diameters and material specifications. The offset position and welding parameters can be adjusted based on the specific ring dimensions, allowing the same basic process to efficiently produce various sizes of welded rings without requiring fundamentally different production methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures a higher and more consistent welding quality by minimizing the double weld puddle effect and allows for more flexible production of rings with varying diameters.
Implementation Method 1
performing the welding from both side edges of the ring from the outside inwards up to the offset
Implementation Method 2
performing the welding from both side edges of the ring from the outside inwards up to the offset. A flush weld is thereby made at both edges of the ring
Data Source
AI summary
For producing a welded ring, a band having a length corresponding to the circumference of the ring is bent to form a ring and its two ends are welded together. The band ends to be welded together have an offset in the circumferential direction of the ring, the offset lying in the plane of the band. The welding is performed form both lateral edges of the ring from the outside up to the offset. This avoids an overlapping weld of a welding quality that is different at the centre of the ring from that at the edges.