Dissimilar joining of AISI 304L/St37 steels by TIG welding process

Abstract

In present work the weldings of an austenitic stainless steel (AISI 304L) and a ferritic carbon steel (St37) were conducted by tungsten inert gas (TIG) welding process using four different austenitic filler metals, namely ER308L, ER309L, ER316L and ER310. Microstructure characteristics and mechanical properties of the weldments were studied using optical and scanning electron microscopy, ferrit-ometry, hardness, tensile and impact tests. The ferrite number (N F ) of the weldments made by different electrodes varies between 0.5 and 9.5. It was found that the increase in amount of delta ferrite in the microstructure of the weld metals, causes the decrease of the impact toughness of the weldments. It seems that using ER309L and ER316L electrodes can provide a good combination between the mechanical and metallurgical properties of the joint in AISI 304L/St37 dissimilar welding.

Microstructure, mechanical properties and corrosion behavior of laser welded dissimilar joints between ferritic stainless steel and carbon steel

“…Because grains close to the fusion line were undergo higher peak temperature treatment than those a little far away which were recrystallized and refined, Upper Bainite and Widmanstatten ferrite formed as shown in Fig. 5(b) which is consistent with the observation reported [6,[14][15][16]. The width of coarser grain area near interface in high temperature HAZ (HTHAZ), refined grain area in lower temperature HAZ (LTHAZ) of CS and the width of HAZ in FSS are given in Table 3.…”

Effect of heat input and weld chemistry on mechanical and microstructural aspects of double side welded austenitic stainless steel 321 grade using tungsten inert gas arc welding process

“…The double side-tungsten inert gas weldments show lowest absorbed energy 119.0 J compared to base metal 123.17 J. This is because of the existence of higher induced δ-ferrite in the weld metal [31,32]. The samples could not entirely break in the notched area.…”

Nikel Bazlı Süper Alaşım Inconel 625 ile AISI 304L Paslanmaz Çelik Malzeme Çiftinin Birleştirilmesinde Farklı İlave Metallerin Tokluk ve Mikroyapısal Özelliklere Etkisi

“…Kapak pasonun olduğu bölgede malzeme hızlı soğumaya maruz kaldığından ve tekrar bir ısıl işleme maruz kalmadığı için ferrit miktarındaki artış kaçınılmazdır. Mikroyapı resimleri incelendiğinde birincil dentritler ostenit (koyu bölgeler), dentritler arası ötektik ferrit (açık bölgeler) olarak gerçekleşmektedir (9). Mikroyapı fotoğrafları incelendiğinde kaynak metali kapak pasosunda ferrit miktarının soğuma hızının yüksek olmasından dolayı arttığı görülmüştür.…”