Experimental Investigation of Rockwell Hardness and Charpy Impact Test of Tungston Inert Gas (TIG) Welded Joint of Duplex Stainless Steel-2205 Specimen - Review and Experimental Study

Oct 22, 2026

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The study investigates Rockwell hardness and Charpy impact strength for Tungston inert gas (TIG) welded joints made from Duplex Stainless Steel-2205 specimens. Emphasis is placed on hardness and impact resistance as key indicators of a material’s ability to withstand sudden loading and service conditions, including the need for reliable welded pipe joints with minimal leakage. TIG welding parameters are selected, followed by machining a 2 mm notch and conducting Rockwell hardness testing and Charpy impact testing to evaluate toughness through absorbed impact energy.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages6

Reading Time15 min

AccessFree to download

ABSTRACT

INTRODUCTION

METHODOLOGY FOLLOWED IN PRESENT WORK

Two specimen preparation and TIG welding conditions

Notch preparation and testing sequence

EXPERIMENTAL APPARATUS

GAS TUNGSTEN ARC WELDING (GTAW/TIG)

ROCKWELL HARDNESS TEST

Experimental Investigation of Rockwell Hardness and Charpy Impact Test of Tungston Inert Gas (TIG) Welded Joint of Duplex Stainless Steel-2205 Specimen G. K. Kiran Kumar Department of Mechanical Engineering, Siddartha institute of science and technology, Puttur, Andhra Pradesh India ABSTRACT The main aim of my present work is to study and investigate the Hardness and Charpy impact strength of Tungston inert gas (TIG) welded joint of Duplex Stainless steel specimen. The Hardness and impact strength is most important factor in considering the transport of gases & liquid fluids over a long distance which is mostly carried in pipe lines and making huge pipe without joints is impossible. So, there is possible of making joints in pipes so, we prefer to have strong joints in pipes in which there is no possible way in leakages and in this present work we choose TIG welding and calculate its hardness & impact strength. Keywords : TIG Welding, Charpy Impact Test, Hardness Nomenclature: ASTM – American society for Testing and Materials I. INTRODUCTION With the Modern Technological advancement, more structural materials are designed to carry heavier loads. Many structural parts need to be welded and the discontinuous parts of these structural materials need up to the mark of standard design to carry these loads. The hardness and impact strength are main determining factor to check whether material can withstand sudden loads. The Duplex Stainless steel- 2205 is an austenite-ferrite alloy with the addition of Nickel, copper, chromium etc… It is designed to provide exceptional resistance to many corrosive environments. The nickel content is sufficient for resistance to chloride ion stress corrosion cracking. Toughness of material in physical sense gives the energy a specimen can absorb when affected with sudden load until failure. Charpy Impact Testing is an ASTM standard method of determining the impact resistance of materials. An arm held at a specific height (constant potential energy) is released. The arm hits the sample. The specimen either breaks (or) the weight rests on the specimen. From the energy absorbed by the sample, its impact energy is determined which indirectly determines the toughness of specimen. II. METHODOLOGY FOLLOWED IN PRESENT WORK 􀂾 Two Duplex Stainless steel Specimen of 55*55 mm were prepared for TIG welding 􀂾 TIG welding was carried out at 105A and current of 22V. The specimen is welded with non-consumable electrode to make it more effective than arc welding. 􀂾 The filling of Specimen was carried out with proper joining and removing impurities on the welded surface. 􀂾 After getting the required welded specimen, the notch was prepared of 2mm depth by means of shaper machine. 􀂾 The testing of welded joints first carried out in Rockwell Hardness Testing Machine and second it is carried out in Charpy Impact testing machine. III. EXPERIMENTAL APPARATUS A. GAS TUNGSTEN ARC WELDING (GTAW): In the GTAW process, an arc is established between a tungsten electrode and the base metal(s) . Under the correct conditions, the electrode does not melt, although the work does at the point where the arc contacts and produces a weld pool. The filler metal is thin wire that’s fed manually into the pool where it melts. Since tungsten is sensitive to oxygen in the air, good shielding with oxygen-free gas is required. The same inert gas provides a stable, inert environment to protect the weld pool as it solidifies. Consequently, GTAW is commonly known as TIG (tungsten inert gas) welding. Because fluxes are not used (like SMAW), the welds produced are sound, free of contaminants and slags, and as corrosion-resistant asthe parent metal. Tungsten’s extremely high melting temperature and good electrical conductivity make it the best choice for a non-consumable electrode. The arc temperature is typically around 11,000° F. Typical shielding gasses are Ar, He, N, or a mixture of the two. As with GMAW, the f

FAQs

What is the main objective of the present work?

To study and investigate the hardness and Charpy impact strength of TIG welded joints of Duplex Stainless Steel-2205 specimens.

How were the TIG welded specimens prepared and tested?

Two duplex stainless steel specimens were TIG welded using the stated parameters, then a 2 mm notch was prepared using a shaper machine. Hardness was tested using a Rockwell hardness machine and impact strength was measured using a Charpy impact testing machine.

What does the Rockwell hardness test determine in this study?

It measures hardness at a specified Rockwell scale (including Scale B with a steel ball indenter), using the principle of differential depth measurement.

Oct 22, 2026

Uploaded by asda1da