Angled Weld Seam for Variable Cross-Section Boom Sections
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Solution Overview
Problem
Existing boom sections for telescopic cranes have a constant lateral cross-section along their length, leading to overdimensioning in regions with smaller loads and underdimensioning in regions with larger torques, resulting in excessive material usage and costs.
Innovation Solution
The boom section features a weld seam between the lower and upper shells that is angled in at least one region, allowing for varying cross-sectional properties along the length, with thicker lower shells in high-load areas and thinner upper shells in low-load areas, optimizing material usage and adapting to different load scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lower and upper shells are welded in parallel with section edges to ensure constant lateral cross-section, then manufacturing simplicity is improved, but material overdimensioning occurs in low-load regions
Solution Approach 1:
The weld seam is designed to extend at an angle to the section edges rather than parallel, enabling the lower shell to have variable thickness along the boom section length. This allows thicker sections in high-load regions and thinner sections in low-load regions, optimizing material usage while maintaining structural integrity where needed
2Strength
If the lower shell is designed with sufficient thickness to handle maximum torque, then strength is improved, but weight increases due to overdimensioning in low-load regions
Solution Approach 1:
The angled weld seam configuration enables the lower shell thickness to vary along the boom section, providing maximum thickness where high torques occur and reduced thickness where loads are smaller, thereby maintaining strength requirements while minimizing weight
Solution Approach 2:
The design transitions from a static, uniform cross-section to a dynamic, variable cross-section that adapts to the varying load distribution along the boom section length, optimizing the strength-to-weight ratio at different positions
3Ease of manufacture
If the lateral cross-section is kept constant along the boom section, then manufacturing simplicity is improved, but adaptability to varying loads deteriorates
Solution Approach 1:
The angled weld seam creates a variable cross-section design where the lower shell dimensions are optimized for local load conditions at each position along the boom section, improving adaptability to varying loads while maintaining reasonable manufacturing complexity
Solution Approach 2:
The design changes the geometric parameters of the lower shell cross-section along the boom section length through the angled weld seam configuration, allowing the structure to adapt its properties to match the varying load distribution
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 design reduces material usage while increasing the permissible payload, as the boom section's mechanical properties are tailored to specific load scenarios, minimizing unnecessary material and weight.
Implementation Method 1
the lower shell and the upper shell are welded to one another
Data Source
AI summary
A boom section for the boom of a telescopic crane has a lower shell and an upper shell. The lower shell and the upper shell are welded to one another, and the weld seam extends between the lower shell and the upper shell angled in at least one region to at least one section edge of the boom section.