ARC Rods - Low Hydrogen
High Tensile Steel ElectrodesThis group of electrodes is suited for welding all thicknesses of steel, either wrought or cast, and even high carbon variants, provided the appropriate pre-heat and post-weld heat treatment is applied. A moisture free chemically basic flux coating that is resistant to subsequent moisture reabsorption which ensures very low as opposed to low weld metal hydrogen levels* and thus the absence of weld metal and HAZ hydrogen embrittlement. (Note : very low hydrogen levels = H2 < 5 ml/100g; low hydrogen levels = H2 < 10 ml/100g)
Weld metal with low levels of oxygen and non-metallic inclusions which imparts great resistance to solidification cracking on exceptionally thick sections under great restraints. The higher the Mn-Si ratio, the greater the resistance to solidification cracking. For the class of electrode they represent, exceptional sub-zero toughness values are obtained, eg: general purpose types assure toughness values to at least -30 ºC, the higher manganese alloyed types to at least -50 ºC and the nickel alloyed types to -80 ºC. Both strength and toughness properties of the weld metal are maintained after most weld stress relief heat treatments.