Nickel and nickel based alloy stick electrode is mainly used for welding nickel and nickel alloys, it can also be used for welding dissimilar metals and surfacing, groove dimensions and welding process of welded joints are close to the Ni-Cr austenitic steel processes. There are precautions during welding.
1.Thermal conductivity of nickel and nickel based alloys is poor, overheat is easily lead to grain becomes large, thus the welding operation should use a smaller welding current, Electrode is preferably not swung horizontally. At the end of welding, we should note that fill the crater and maintain a lower layer temperature.
2.Nickel is very easily embrittled by sulfur and lead, the formation is called thermal cracks. It is necessary to strictly control the sulfur and lead content in electrode, Should carefully clean up before welding, remove oil, paint, dust and other dirt on the base metal surface.
3.Stomatal sensitivity of nickel and nickel alloy welding is strong, so the electrode contained an appropriate amount of lead, titanium, manganese, magnesium deoxidizer, we should pay attention to control the length of the arc during operation.
