Q235 weldability?
A: Excellent weldability, low carbon content, low hardening tendency in the heat-affected zone, suitable for various welding methods.
Common welding methods and welding materials?
A: Manual arc welding: E4303 (J422), E4315 (J427)
Gas shielded welding: ER50-6, ER49-1
Submerged arc welding: H08A + HJ431
Does Q235 welding require preheating?
A: For plate thickness ≤20mm and ambient temperature ≥5℃, no preheating is required; for thickness >20mm or low temperature, preheat to 50–80℃.
What welding materials are used for welding dissimilar steels Q235 and Q355?
A: Choose the lower-grade material, E43 series or ER49-1.
What are the common welding defects of Q235 and their prevention? A: Porosity (drying the welding rod, cleaning the surface), slag inclusions (slag removal, proper rod handling), deformation (controlling heat input).