The effects of TIG welding parameters on the microstructure and mechanical properties of AISI 316L stainless steel

Abstract

In this study, AISI 316L austenitic stainless steel, which is widely used in nuclear power plants due to its high corrosion resistance, is joined by TIG welding method at different welding currents and welding speeds without using additional wire. Then, the heat inputs of the produced welded joints were calculated and macro and microstructure studies, hardness, tensile and bending tests were applied to the samples. As a result of the microstructure studies, it has been observed that the weld metal has a microstructure consisting of austenite + Skeletal ferrite or delta ferrite. As a result of the hardness tests, it was observed that the hardness decreased with the increase of the welding current, and the hardness increased with the increase of the welding speed. As a result of the tensile tests, similar to the hardness measurements, the tensile strength decreased with the increase of the welding current, while the tensile strength increased with the increase in the welding speed. No tearing or cracking was observed in either the cap twists or the root bends in the 1800 bending tests.

Keywords

• TIG Welding
• AISI 316L Stainless steel microstructure
• Mechanical properties

TIG kaynak parametrelerinin AISI 316L paslanmaz çeliğinin mikro yapı ve mekanik özelliklerine etkisi

Öz

Bu çalışmada yüksek korozyon direnci nedeni ile nükleer güç santrallerinde yaygın bir şekilde kullanılan AISI 316L östenitik paslanmaz çelik, TIG kaynak yöntemi ile farklı kaynak akımlarında ve kaynak hızlarında, ilave tel kullanılmadan birleştirilmiştir. Daha sonra üretilen kaynaklı birleştirmelerin ısı girdileri hesaplanarak, numunelere makro ve mikroyapı çalışmaları, sertlik, çekme ve eğme testleri uygulanmıştır. Mikroyapı çalışmaları sonucunda kaynak metalinin östenit+çatısal ferrit ya da delta ferritten oluşan bir mikroyapıya sahip olduğu görülmüştür. Sertlik deneyleri sonucunda kaynak akımının artması ile sertliğin düştüğü gözlenirken kaynak hızının artması ile de sertliğin yükseldiği belirlenmiştir. Çekme deneyleri sonuçları ise sertlik ölçümleri ile benzerlik göstererek kaynak akımının artması ile çekme dayanımı düşerken kaynak hızının artması ile çekme dayanımı artmıştır. Yapılan 1800 eğme testlerinde ise ne kep eğmelerinde ne de kök eğmelerinde herhangi bir yırtılma ya da çatlamaya rastlanmamıştır.

Anahtar Kelimeler

• TIG kaynağı
• AISI 316L paslanmaz çelik
• Mikroyapı
• Mekanik özellikler

Kaynakça

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