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Welding is the fusing of metals together by a localised melting and
filling process . Both permanent and temporary repairs may be made using
underwater welding tools. Many marine salvage operations have only been
made possible due to the development of welding processes. There are
many different types of welding in use to-day above the water line ,
including Oxy-acetylene, resistance , brazing , soldering thermite ,
flash welding and electric arc welding. Only the latter though has found
a place in underwater work .
The welding cable carries the current to the diver and is generally in lengths of 50 feet. There is a short length connected to the holder which is usually 10 feet long. The ends of the cable are joined using lugs and copious amounts of electrical insulating tape. The welding electrode holder must be well insulated and robust and must be of the quick change type to allow the diver to change the rod easily. The clamp is used to earth the work piece and is connected to the 'ground or' earth' .
A wire brush and chipping hammer are used to clean the material. The
welding electrode is is thick wire , covered with flux , and underwater
electrodes given the number 60 The coating most favoured in the 1950 s
was Sealac and Ucilon. This was made up by a mixture of acetone and
celluloid. Acetone being very flammable extreme must be taken when
making up the solution .
A chaffing suit is a useful addition whilst working with welding
equipment. Lastly and very important a signalling device, usually a rope
to indicate to the tender topside when to turn the current on or off as
this occurs frequently when welding is in progress.
|Country: United Kingdom|
|Year: Circa 1956|
|Size: 15 inches x 15 inches|
|Capacity: 50 - 100 Volts 400 Amps|
|Case: Hardwood - Oak|
|Remark: Heavy duty knife with added protection of 4 poles|
|Country: United States|
|Size: 12 inches x 6 inches|
|Capacity: 200 Amps|
|Case: Black Bakelite|
|Handle: Black Bakelite|
|Remark: Notice the Heavy duty plugs|