Hybrid Welding of Thermoplastic Panels With Adhesive-Assisted Weld Gaps
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Solution Overview
Problem
Traditional welding methods face challenges in accessing and joining polymer vehicle panels with severe angle changes and non-planar geometries, leading to quality control issues and increased scrap parts due to interruptions in welds.
Innovation Solution
A process involving curable adhesives applied at hindered weld areas, combined with infrared welding techniques, to ensure a solid bond between panels, particularly in areas with vertical contour changes, using heat-resistant adhesives like moisture-curable urethane and flame treatment for superior bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional welding methods are used on polymer panels with severe angle changes and non-planar geometries, then welding speed and productivity are maintained, but weld quality deteriorates due to interruptions and access difficulties
Solution Approach 1:
The weld line area is divided into multiple portions: a first weldable portion that can be accessed by traditional welding methods, and a second portion with severe angle changes where welding is substantially hindered. This segmentation allows each portion to be treated with the most appropriate joining method.
Solution Approach 2:
Different joining methods are applied to different portions of the weld line based on local geometric characteristics. The first portion receives welding while the second portion receives adhesive application, optimizing the joining process for each specific area's accessibility and geometric constraints.
2Reliability
If adhesive is applied at all weld areas, then bonding reliability is improved, but manufacturing complexity increases due to additional process steps
Solution Approach 1:
Adhesive is applied selectively only at the second portion where welding is substantially hindered, while the first weldable portion uses traditional welding. This localized application of different joining methods optimizes reliability without unnecessarily complicating the overall manufacturing process.
Solution Approach 2:
Instead of applying adhesive at the entire weld line, the process applies adhesive only partially at the specific second portion where welding access is problematic, achieving sufficient bonding reliability with minimal additional process complexity.
3Reliability
If panels are positioned for welding first, then adhesive is applied, then panels are repositioned, then welding is performed, then adhesive curing time is extended, but production time increases and productivity decreases
Solution Approach 1:
The panels are positioned and clamped in the welding fixture before adhesive application. The clamps hold the panels together during adhesive curing, eliminating the need to reposition panels and allowing curing to occur during the welding setup time rather than requiring separate curing time.
Solution Approach 2:
The adhesive curing process is merged with the welding setup and clamping process. The panels remain clamped during both adhesive application and curing, combining multiple operations into a single workflow that eliminates idle time and maintains productivity.
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 process effectively joins polymer panels in hard-to-reach areas, reducing scrap rates and enhancing production quality by maintaining a strong bond during adhesive curing and using suitable welding techniques like infrared welding.
Implementation Method 1
A curable adhesive is provided and applied at the second portion
Implementation Method 2
A curable adhesive is provided and applied at the second portion
Implementation Method 3
The panels are then welded at the first weldable portion
Data Source
AI summary
A process for welding of at least two separate vehicle panels (12, 14) to form an integral part (16) for a vehicle. There is provided at least one first panel (12) including a first weld line area (18) and at least one second panel (14) including a corresponding second weld line area (19), the second weld line area (19) abutting in a weldable relationship to the first weld line area (18). The first and second weld line areas (18, 19) have at least one first weldable portion (22) and at least one second portion (24) at which welding is substantially hindered during welding attachment of the first and second panels (12, 14). The process includes applying a curable adhesive at each second portion (24), placing in a welding fixture and welding the panels (12, 14) at each first weldable portion (22) such that the panels (12, 14) are held together during curing of the adhesive.