Q235 weldability?
A: Excellent weldability, low carbon content, generally no preheating required, suitable for manual arc welding, submerged arc welding, and gas shielded welding.
What are the commonly used welding electrodes for Q235 welding?
A: E43 series (such as E4303, E4315), matching the Q235 strength grade.
Does Q235 welding require preheating?
A: For thicknesses ≤30mm, no preheating is required at room temperature; for thick plates/low-temperature environments, preheat to 100-150℃.
Can Q235 and Q355 be welded together?
A: Yes, use E50 series welding electrodes, controlling the process according to Q355 requirements.
Does Q235 welding require heat treatment after welding?
A: Generally, no heat treatment is required after welding for structural applications; for thick plates/dynamically loaded structures, stress-relief annealing (600-650℃) is recommended.