Weldability of a high-strength weathering steel Q450NQR1 was studied by selecting welding consumables and methods,welding technology and microstructure mechanical property of the welds is also studied. The results show that the mechanical properties of the welding joints meet technical requirements when using S-8018 electrode and BH550-NQ-A wire. The weld microstructure of the two process methods are basically the same, consisted of mainly needle-like ferrite plus a small amount of proeutectoid ferrite. The microstructure of overheated zone are both granular bainite. The microstructures of normalized and not fully normalized zones are both ferrite plus perlite. The changes of welding heat input have little effect on microstructure of the weld joints and heat affected zone.
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