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Underwater Welding by Harold Canning CllTSlD Underwater welding takes a lot of skill and the ability to weld in all conditions. You should be well prepared for the job. Underwater welding is done primarily on mild steel with special underwater welding electrodes that develop strength electrodes. These will produce welds 802 of the tensile and 502 of the ductility of similar welds made on the surface. If a weld to be made is of a critical nature, it is generally advisable to make a test weld at the same water depth and working conditions. The power source for under- water welding is a 300 ampere De generator connected for straight polarity. An insulated durable electrode holder which permits the easy changing of electrodes. The welding is done with 3!l6H or 5!32H diameter electrode. The two commercial brands of electrodes are Flexarc Sw and Lincoln Fleetweld 37. It's a good idea to waterproof 4. Place the end of the electrode against the lsft endo of the work at about l5 to 45 and called for current on. Press the electrode against the work and move the electrode along the line of weld at an even speed! After the electrode has burned down to the stub, call for current off. 5. Clean the end of the previous deposits and make a slight overlapajz when the weld is resumed. 6. Use the same technique for the elctrodes in some waterproofing te1ephOne. The diver ShOu1d solution. when it is waterproofed, care must be taken to clean off the tips so enough of the bare wire is exposed for easy starting of the arc. To weld under water you have to follow these steps. l. with 3!l6U electrodes, set the machine for 225 to 280 amps, at a depth of 50 feet in the water. The 5!32H electrodes use less current and are consumed in a slightly shorter time than 3!l6H electrodes. 2. Because of poor vision under water, fillet welds should be used in order to provide an edge that the diver can use as a guide. The work must be clear. 3. Attach the ground clamp as close as possible to the section to be welded. O, I 3611 'Wa 'Wa wffaswafx, xeeswofwaxaeasavafw , caxaassxfx eaeameex, ,axwfwffwafxfxemmewxx yaewaeewfwffwexwwam .fx wqxfxydxfxfmvwwfx iyaxeywxwxxaxaewwx we 369Wv'367d3696CWv'7o5f095 wx, eaxewwafwfxafx 3 ':25'AWo'W:9596'7fZv 0 W1 xfwafx, wax M wfxfxfx 7f7f6 9WPA7:?6?6'7fZv '7P!PWWf7a'w6'Z:'fo'Z 7fW1'Wf'Zff1fZv96'X:'X: 7aWa7oWfWPWo70fWo'7o'7vWo'2 vertical welds. , 2070 0 0301 0 0 0030900000057 7. Overhead welds require M35 Zwgmzawawyawagzwggwzw greater skills. If you increase X96 Zmwgwwywwemywwgy M th8 angle of the electrode up to WX, ywfawfoygcwdygyafyofygo ff 55 it will help improve the 331 Z 0 ,OO A contour of the weld. X90 fawagzkmvwaagmn , 9JWo'Wf7o'7oVvWfA0!fA fb xfwfffffxfffffwfx W xfwwaxfxfxffofx ff? xeawwofxm, Eight Most Important Safety 7vw recautions 00 75? 00000 W 267675022022 l. Only a qualified diver and 7? WOVWM assisted by an experienced tender fo? WWJSWJXJ should attempt underwater welding. Q' VJEQSWM 2. The diver should also practice AW VA, ZIICKUXUZP above water. 070 703650 3. Instructions from the 7570? ?W1 equipment manufacturer should be f:76?5?69WaS'6WZvi596 followed carefully. ,X A W5 ZZ 4. The diving gear should be in 0,72'6Wf7w0Wa I AWA good condition, and equipped fffl'9 70W Y ffffw' with a reliable loudspeaker ywogfm 0 wear rubber mittens. X 5. The diver must not permit X X any part of his body or gear to X X become a part of the electric C'iY'CUlt. JQQQC :Dc 6. The current should be off at X all times except when the diver XXXXX Xxx is actually cutting or welding at X XX XX the work. X X X X X 7. After each day's use, the X XX XX torch or welding holder should x xxx x be rinsed in fresh water and X X dried. This is to help maintain XX XDCXXX U proper operating efficiency. X XXX5 XXX X 8. Because difficult footing X XXXXXX X X and poor visibility generally XXXXXXX X X, handle torch orvmlding holder XXXXXX XXXXXXXXXX with care, staying completely XXg X X clear of all hoses and avoiding xx x XXX X X too much slack in his lines. x x XXX X X Keep all hoses and lines away x x X X from the cutting or welding x :x x x x XX operation. X X X X X X x x In conclusion, underwater x x xxx x x welding is a very challenging XX XXX X X job. It could be fun welding x X X under water and it can also x X X be very dangerous if you are X XXXX X not qualified to do the job. XXXXX XX xxx x xxx x xx JCC
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