High-strength welding process for making heavy glass preforms with large cross sectional areas
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United States of America Patent
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Aug 29, 2023
Grant Date -
Jul 23, 2020
app pub date -
Jan 17, 2020
filing date -
Jan 22, 2019
priority date (Note) -
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Abstract
An apparatus and related process for producing a high-strength weld between two glass components. Chucks clamp and move respective first ends of the glass components toward each other inside an enclosure, where the second ends are heated, softened, and welded together in a weld zone. The enclosure has layers of stacked quartz glass bricks and allows the weld zone to cool slowly and avoid stress. A propane quartz melting torch directs a flame inside the enclosure and toward the second ends as the glass components move toward each other. The flame softens the second ends and creates substantially smooth polished surfaces in the weld zone having an increased hydroxide content. At least 80% of the weld zone has a hydroxide content greater than about 10 ppm average in a 10 μm depth from the surface and the tensile strength of the weld zone is above about 10 MPa.
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