• Before welding, the electrodes need to be baked for 1 hour with the temperature of 150±10℃ before using.
• It can eliminate welding stress and avoid crack by hammering the welding seam.
• In order to reduce the impurity elements in the base metal penetration weld, narrow white band width, improve crack resistance and processing properties, it should use small current welding in cast iron cold welding.

For deformation correction in hot state, mechanical correction and hammering are strictly prohibited in the range of blue brittle temperature (300℃~500℃) to avoid brittle cracks.

Flame Local Heating Requirements:

• It is not advisable to repeat heating at the same part to avoid changes in the metallographic structure and mechanical properties.
• Do not cause repeated corrections of tension and compression in the same part.
• For hardenable welded parts, watering and rapid cooling are strictly prohibited.
• Welding parts that need to be annealed should be rectified before annealing to eliminate internal stress.
• The flame straightening heating temperature can be 700℃~850℃ (fuchsia), and should not exceed 900℃ (bright red) for low alloy structural steel.