What should you do when welding metal on metal?

When welding metal on metal, it is important to consider the potential for corrosion and the integrity of the weld. Using a corrosion spray helps to protect the areas that will not be welded from rust and oxidation, which can compromise the quality and durability of the welded joint. Corrosion can weaken the surrounding metal over time, so applying such a spray can enhance the longevity of the weld and maintain the structural integrity of the piece.

Preparation is a key factor in successful welding. Welders typically clean the surfaces to remove any rust, paint, or debris, and they may prepare them in other ways, depending on the materials involved. By applying a corrosion spray before welding, you are taking a proactive step to ensure that the metal remains protected, which is particularly vital in environments prone to moisture or chemical exposure.

The other methods mentioned, like using a higher heat setting or welding without preparation, could lead to poor-quality welds or damage to the materials being welded. Similarly, while a bonding agent might serve specific purposes in certain materials or applications, it is not a standard practice when doing metal-to-metal welding where proper welding techniques and preparation are crucial.