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1. Surface Preparation The success of soldering hinges on proper surface preparation. Before soldering, it is essential to remove any oils, dirt, or oxidation from the surface. For galvanized iron, this often means using a wire brush or sandpaper to clean the area. It's also critical to remove the zinc coating at the joints to promote better adhesion.
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Once the graphics are finalized, manufacturers move to the creation of the tin boxes themselves. The process involves cutting and shaping sheets of steel, which are coated with a layer of tin to prevent rusting and ensure durability. The pieces are then pressed into shape and assembled—usually featuring a hinged lid and a sturdy handle, reminiscent of the lunch boxes popularized in the mid-20th century.
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