Laser-Welded Joint Structure for Hot-Stamping Strength
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Solution Overview
Problem
Existing joint bodies formed by welding metal members are susceptible to insufficient joint strength, leading to separation during hot stamping and inadequate reinforcement under external forces.
Innovation Solution
A joint body design featuring a welded portion with intersecting longitudinal and connecting portions, extending in multiple directions, and a manufacturing method using a laser oscillation system to create a continuous, two-dimensional welded pattern, enhancing joint strength between metal members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional laser welding is used to join metal members, then the manufacturing process is simple, but the joint strength is insufficient causing separation during hot stamping and under external forces
Solution Approach 1:
The patent transitions from conventional one-dimensional linear welding to two-dimensional planar welding patterns. The welded portion extends in multiple directions (first direction along the metal member, second direction across the metal member) to form a grid-like structure with intersecting longitudinal and connecting portions, thereby increasing joint strength without excessive complexity
Solution Approach 2:
The welded portion is divided into multiple segments including first longitudinal portions, second longitudinal portions, and connecting portions arranged in a grid pattern. This segmentation allows the welding to be distributed across multiple zones, enhancing overall joint strength while maintaining manufacturability through systematic laser oscillation
2Reliability
If conventional linear welding is used, then the welding process is fast and simple, but the joint body cannot withstand hot stamping processing and collision forces
Solution Approach 1:
The welding process is extended from linear one-dimensional movement to two-dimensional planar oscillation. The laser beam oscillates in both the first direction (along the metal member) and the second direction (across the metal member), creating a comprehensive welded network that ensures reliability during hot stamping and collision while remaining manufacturable through controlled oscillation parameters
3Strength
If a two-dimensional welded pattern is created using laser oscillation, then joint strength is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The laser oscillation system performs periodic oscillatory movements in both the first and second directions. This periodic action creates the two-dimensional welded pattern through controlled back-and-forth motion, achieving enhanced joint strength while managing device complexity through systematic cyclic motion rather than complex multi-axis coordination
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
The enhanced joint strength allows for successful processing by hot stamping and increased reinforcement against collisions, providing a robust vehicle frame component.
Implementation Method 1
a joint body including a first metal member, a second metal member placed on the first metal member, and a joint portion including a welded portion where the first metal member and the second metal member are joined together by laser welding
Data Source
AI summary
A joint body includes first and second metal members and a joint portion including a welded portion where the first and second metal members are joined together, the welded portion having a line shape. The joint portion includes first and second longitudinal portions and a plurality of connecting portions. The first longitudinal portion has first intersecting portions arranged in a first direction and extends in the first direction. The second longitudinal portion has second intersecting portions arranged in the first direction and extends in the first direction. The welded portion intersects itself at the first and second intersecting portions. The connecting portions are arranged in the first direction. The connecting portions extend in a first direction and connect the first and second longitudinal portions.