① Dry the electrodes at 350~400 ℃(662~752℉) for 60 minutes before use.
② Preheat at 100~150℃(212~302℉). The temperature varies in accordance with plate thickness and kind of steel.
③ Adopt back step method or strike the arc on a small steel plate prepared for this particular purpose because arc striking on the base metal is in danger of initiating cracking.
④ Pay attention not to exceed proper heat-input because excessive heat-input causes deterioration of impact values of all weld metal.
① OffShore Structure
② LPG vessel
③ LPG storage
④ Heat Exchanger
① 55kg grade low-hydrogen high tensile electrode (-60°C)
② Ni, Ti, B contained in the weld-metal.
③ Great tensile strength in low-temperature
④ Anti- Low temperature crack (Low hydrogen)