Welding Preheating Requirements?
No preheating required for thickness ≤20mm and ambient temperature ≥5℃; for thickness >20mm or ambient temperature <5℃, preheat to 50-80℃.
Can it be quenched for strengthening?
Not recommended. Low carbon content results in poor hardenability, limited strengthening effect, easy deformation and cracking, and low cost-effectiveness.
Common Heat Treatment Methods?
Normalizing: Air cooling at 850-900℃ to refine grains and improve strength uniformity; Stress-relief annealing: Slow cooling at 500-650℃ to eliminate residual stress from cold working/welding.
Cutting Precautions?
Abrasive wheel cutting: Fix the workpiece, stand to the side of the abrasive wheel, and avoid splashing;
Plasma cutting: Wear a protective mask and maintain ventilation;
Grind burrs after cutting to avoid affecting assembly and welding.
Key Points for Bending and Forming?
Bending radius: Minimum bending radius ≥ thickness (to avoid cracking); Thick plates (≥8mm) should be bent slowly in stages to avoid large-angle bending at one time; Allow to cool naturally after bending, and water quenching is strictly prohibited.