... flat and flat angle welding, against effectively air hole, for building of ships, bridges, machinery, and cars, etc. E70T ... property, low expansive hydrogen content, good crack proof, for building of machinery, water, electric and petrochemical equipment, etc. E71T ... content < 5ml/100g (chromatograph) for welding of important steel structure of low temperature, etc. E308LT1-1 E308LT1-1 Extra-low ...