保護氣體組成對沃斯田不銹鋼銲件性質之影響

Effect of Shield Gas Compositions on the Properties of Austenitic Stainless Steel Weldment

陳明祥(Ming-Hsiang Chen) ； 張昀(Yun Chang) ； 徐志凱(Jhih-Kai Syu)

《聯大學報》 10卷2期 (2013/12) Pp. 101-110

摘要

本實驗係利用電漿電弧銲對沃斯田不銹鋼實施不填料銲接，以研究保護氣體組成對沃斯田不銹鋼銲件性質之影響。實驗內容包括電漿銲接、肥粒相含量量測、微硬度試驗、拉伸試驗、衝擊試驗、動電位極化試驗與微觀組織觀察等。實驗結果顯示含氮保護氣體電漿銲接對沃斯田不銹鋼銲件微觀組織與機械性質有顯著的影響，沃斯田不銹鋼銲件殘留肥粒相含量隨保護氣體含氮量的增加而降低，而銲件的抗拉伸強度、微硬度、低溫衝擊值及抗腐蝕性則隨保護氣體含氮量的增加而增加，推斷其原因可能與氮原子在沃斯田鐵不銹鋼銲接金屬中的固溶強化與析出硬化效應有關。

關鍵字

電漿電弧銲接 ； 沃斯田不銹鋼 ； 肥粒相含量 ； 混合保護氣體

並列摘要

The objectives of the present study was to investigate the effect of Ar-N2 mixed shield gases on ferrite content, microstructure, toughness, corrosion resistance and mechanical properties in austenitic stainless steel weldment. Autogenous plasma arc welding (PAW) was conducted on SUS 304 stainless steel to produce a bead-on-plate joint. The experimental results show that delta ferrite content in austenitic stainless steel welds decreased as nitrogen addition to the argon shielding gas increased. Added few of nitrogen to the shielding gas has a remarkable effect on ferrite number reduction in austenitic stainless steel welds. This study discovered that not only improved corrosion resistance but also enhanced hardness and toughness of austenitic stainless steel welds by added nitrogen to shielding gas during welding process. We inferred the nitrogen ions can be absorbed during welding results in the solid solution strengthening and precipitation hardening.

並列關鍵字

Plasma Arc Welding ； Austenitic Stainless Steel ； Ferrite Content ； Mixed Shielding Gases

參考文獻

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