The Nitrogen Absorption of Iron Weld Metal during Gas Tungsten Arc Welding

概要

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Effects of welding conditions and welding atmospheres on the nitrogen absorption of iron weld metal containing quite low contents of impurity elements during gas tungsten arc welding were studied by using an arc atmosphere-controlling chamber. The nitrogen content of the weld metal decreases with an increase of the welding current, but scarcely depends on the arc length, the arc voltage and the travel speed. In N_2 gas atmosphere, the nitrogen content is extremely high at low atmospheric pressure. In both N_2-Ar and N_2-He gas mixture atmospheres, the nitrogen content increases with the nitrogen partial pressure (P_<N_2>) at low P_<N_2>, and is constant above P_<N_2>, of 0.005 MPa. In N_2-H_2 gas mixture atmosphere, the nitrogen content increases gradually with P_<N_2>, but is lower than in the other atmospheres. The nitrogen content in all of the atmospheres does not obey Sieverts' law. The nitrogen absorption of iron weld metal was discussed with equilibrium data.
社団法人溶接学会の論文
1986-04-01