Stainless steel chain products are used very widely.
Are these chains really safe?
What’s the TIG welding?
[Table-1] Tensile test results SUS304 wire diameter 5mm chain
Table 1 shows that chain with a remarkably low breaking load is being sold.
Their external appearances are similar, so why are the test results so different?
See the sectional photographs of the weld sections.
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Photograph 1
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Photograph 2
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| After the weld section is cut and the cutting plane is washed with acid, the color of the welded part changes. |
Sectional photograph of weld section of chain made by our company |
Sectional photograph of weld section of imported chain made by C |
* The discolored part in the center is the weld section.
Photographs 1 and 2 are sectional photographs of weld sections.
Comparing photographs 1 and 2 shows that the fusion depth of the weld section is shallower.
The fusion depth is shallower, which means that the chain link is not fully connected.
Tensile test sample
Photograph 3
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Photograph 4
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| Chain made by our company after tensile test (Break location is on the end at the left.) |
Imported chain made by C after tensile test (Break location is on the end at the left.) |
Photo 4 shows that the chain broke before being stretched.
A chain is made by connecting individual links. Each link must be securely welded.
If the welding of even one link of a chain is defective, it can cause a truly disastrous accident.
