When the welding elbow structure in the cold processing of the shear (or punching), bending, correction, operation, should ensure that the following specified temperature:
Parts for the ordinary carbon structural steel, when the operating site ambient temperature below -20 ℃; parts for the low alloy structural steel, when the operating temperature of the ambient temperature below -15 ℃, are not allowed to cut and punch, to prevent Low temperature conditions and external forces under the action of cracks.
Welding elbow for the ordinary carbon structural steel, when the operating site environment below -16 ℃; parts for the low-alloy structural steel, when the operating site ambient temperature below -12 ℃, are not allowed to correct and cold bending to prevent Cracks occur under low temperature conditions and external forces.
Cold correction and cold bending not only strictly require the required temperature, but also the bending radius requirements should not be too small, so as not to plastic steel cracks.