1987 Volume 5 Issue 4 Pages 490-496
The submerged arc welding in variously mixed argon-oxygen gas atmosphere was studied experimentally. The effects of oxygen partial pressure were investigeted. Especially the effects on oxygen and nitrogen contents of the weld metal by various oxygen partial pressure were measured.
The influence of oxygen partial pressure on the absorbed energy by Charpy impact test of these metals were also investigated.
The results obtained are summarized as follows.
(1) The oxygen content in the weld metal continues to decrease up to 0.015 MPa of oxygen partial pressure. After oxygen partial pressure exceeds this value, the oxygen content of the weld metal begins to increase again.
(2) The nitrogen content in the weld metal does not change remarkablly irrespective of oxygen partial pressure.
(3) The absorbed energy of weld metal continue to increase up to 0.015 MPa of oxygen partial pressure.After the oxygen partial pressure exceeds this value the absorbed energy of the weld metal begins to decrease again. A colse correlation between absorbed energy and oxygen content of the weld metal was found.
