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How to weld underwater
Identify the site and material of the joint to be welded and clean it.
Most underwater welds involve steel, but metals may vary.
Prepare a chamber to place around the joint (each joint should have a separate chamber).

Select from:
*Much of the sand used during welding will stick to metal, so consider covering the ground with sand if your project requires a flat surface. Waste all the sand that is taken up by the joint.;
*Find a weld compound for the joint to rest in and sandpaper those joints which are closely joined to one another for proper welder techniques. Hammer the joints together using 100/200 grit sandpaper.;
*Chambers range in size-some are large enough to fit several welder-divers, others are only small enough for the welding electrode. Introduce gas into the chamber and pump out the water.;
*Use coarse sand (also also known as regular sand) which should be used sparingly. Sand is mineral grade, free from dirt and grease, making it easier to weld against the cliffs.;
Chambers range in size-some are large enough to fit several welder-divers, others are only small enough for the welding electrode. Introduce gas into the chamber and pump out the water.