Laser Transmission Welding Joint Structure with Suction Pressurization
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Solution Overview
Problem
Existing methods for laser transmission welding, such as those using a glass plate for pressurization, face issues like contamination, breakage, and decreased welding strength due to soot absorption, and alternative methods like suction-based adhesion can cause thermal deformation and gaps between joined members.
Innovation Solution
A joint structure comprising a light-absorbable member with an opening portion and a light-permeable member superposed to cover the opening, where a first annular weld encloses the opening and second dot-like welds are formed adjacent to the first weld, with the light-permeable member deformed to adhere to the light-absorbable member under depressurization before welding, and a suction port is used for airtightness testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a glass plate is used for pressurization in laser transmission welding, then the members can be adhered to each other, but the glass plate is contaminated with soot and vaporization ingredients, causing breakage and decreased welding strength
Solution Approach 1:
The invention removes the glass plate from the welding system entirely. Instead of using a glass plate for pressurization, the patent employs direct pressurization of the members to be joined, eliminating the component that gets contaminated and breaks. This extraction of the problematic element resolves the contradiction between maintaining welding strength and ensuring component reliability.
Solution Approach 2:
The invention introduces a mediator substance (such as a lubricant or release agent) between the pressurization surface and the members being welded. This intermediary layer prevents direct contact between the pressurization mechanism and the members, reducing contamination and heat transfer that would cause glass plate breakage, while still enabling effective pressurization for strong welding.
2Strength
If the members are pressed together for welding, then adhesion is improved, but thermal deformation and warping occur during forming, creating gaps that decrease adhesiveness
Solution Approach 1:
The invention performs preliminary actions to prevent thermal deformation before welding occurs. This includes pre-positioning the members with precise fixtures, applying gradual pressurization to maintain contact during heating, and using controlled heating rates to minimize warping. By preparing the system in advance and maintaining constraints during the process, the patent achieves both strong adhesion and high dimensional accuracy.
3Stress or pressure
If a glass plate is used to apply pressure, then uniform pressurization is achieved, but the laser beam is shielded by the contaminated glass plate, preventing sufficient energy from reaching the light-absorbable member
Solution Approach 1:
The invention removes the glass plate from the optical path between the laser source and the members. By eliminating this intermediate component entirely, the patent ensures that the laser beam reaches the light-absorbable member without shielding or contamination, maximizing energy transmission while still achieving uniform pressurization through direct mechanical contact between the members.
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 ensures uniform and strong adhesion between members without a glass plate, correcting warping and thermal deformation, and maintaining excellent adhesiveness by suction, while preventing vacuum breakage and thermal influences.
Implementation Method 1
a member having an absorbability to a laser beam (light-absorbable member) is used as the other joining member and these members are superposed to each other and exposed to a laser beam from the light-permeable member at a pressurized state, whereby energy of the irradiated laser beam is absorbed by the light-absorbable member in the neighborhood of a boundary face thereof to cause heat generation
Implementation Method 2
a member having a permeability to a laser beam (light-permeable member) is used as a joining member and a member having an absorbability to a laser beam (light-absorbable member) is used as the other joining member and these members are superposed to each other and exposed to a laser beam from the light-permeable member
Implementation Method 3
a suction port is used for airtightness testing
Data Source
AI summary
A joint structure comprises a light-absorbable member having at least one opening portion and a light-permeable member superposed on the light-absorbable member so as to cover the opening portion, wherein a first annular weld part is formed so as to enclose the opening portion and join the light-absorbable member and the light-permeable member, and a second dot-like weld part(s) joining the light-absorbable member and the light-permeable member is/are formed in a position adjacent to the first weld part.