Diagonal Weld Seams for Continuous Metal Strip Rolling
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Solution Overview
Problem
Existing processing methods for metal strips often result in strip tearing at weld seams, particularly during rolling operations, due to the continuous nature of the strip and the stress concentrated at the weld seams.
Innovation Solution
The method involves rotating the strip head and strip tail of the metal strips before welding, allowing the weld seam to form diagonally relative to the transport direction. This approach ensures that only a partial section of the weld seam is subjected to processing at any given time, distributing the load across the metal strips and reducing stress on the weld seams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a continuous strip is fed to the processing device with weld seams connecting metal strips, then productivity is improved, but strip tearing occurs at the weld seams during rolling operations
Solution Approach 1:
The patent applies asymmetry by forming the weld seam at an angle of 45 degrees to the transport direction instead of perpendicular to it. This asymmetric weld orientation ensures that during rolling operations, the roll force does not act directly perpendicular to the weld seam, thereby preventing strip tearing while maintaining continuous processing capability
Solution Approach 2:
The patent implements preliminary action by forming loops in the metal strip before welding occurs. These loops are created at specific positions and tensions before the welding process, allowing the strip to accommodate the diagonal weld seam formation and subsequent processing without tearing
2Strength
If the weld seam extends diagonally across the metal strip, then stress distribution is improved, but the welding process complexity increases
Solution Approach 1:
The patent applies dynamics by making the metal strip itself movable and formable during the welding process. The strip is formed into loops and positioned at specific angles dynamically during welding, rather than requiring a complex fixed diagonal welding mechanism. This reduces device complexity while achieving the beneficial diagonal weld seam orientation
Solution Approach 2:
The patent changes the geometric parameters of the welding process by forming loops with specific dimensions and tensions, and by controlling the strip orientation at 45 degrees during welding. These parameter changes enable diagonal weld seam formation using conventional welding equipment, avoiding the need for complex specialized machinery
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 method significantly reduces the risk of strip tearing and minimizes scrap production by distributing the load across the metal strips and reducing the stress on the weld seams, while also allowing for the retrofitting of conventional welding machines to produce diagonal weld seams.
Implementation Method 1
the respective leading edge is welded by means of a welding machine of the processing plant to the trailing edge of a metal strip
Data Source
AI summary
A processing plant for metal strips (1) has a welding machine, a strip store downstream of the welding machine and a processing device downstream of the strip store. The metal strips are welded to form a continuous strip with the welding machine, which is stored in the strip store and output from there to the processing device. The metal strips are connected via diagonally extending weld seams. To join the weld seams, first the strip head (2) and the strip foot (3) of the metal strips are twisted and the two strips are connected by forming the weld seam. The weld seam extends only transversely to the transport direction (x) during the welding process. Finally, the strip head and the strip foot of the metal strips are twisted back again. As a result, the weld seam now extends diagonally to the transport direction (x).