When soldering galvanized iron, the first step is to prepare the surface properly. This may involve cleaning the area to remove any corrosion, dirt, or impurities that could affect the bond. It's also essential to remove a small portion of the zinc coating at the soldering point to facilitate a better connection between the solder and the base metal.
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Another advantage of door rollers is that they help distribute the weight of the door evenly, preventing it from sagging or becoming misaligned over time. This is especially important for heavier doors or doors that are used frequently, as uneven weight distribution can lead to premature wear and tear on the door and its components.