Arc Welding Processes: Gas Tungsten Arc Welding: Pulse Current, Hot Wire and Activated Flux-Assisted GTAW: Plasma Arc Welding: Principle, System, Application

2021 ◽  
pp. 193-207
Author(s):  
Dheerendra Kumar Dwivedi
Keyword(s):  
System Application ◽  
Arc Welding ◽  
Pulse Current ◽  
Gas Tungsten Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Hot Wire ◽  
Gas Tungsten Arc ◽  
Activated Flux ◽  
Welding Processes

INVAR M93T

Alloy Digest ◽  
2008 ◽  
Vol 57 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Properties ◽  
Arc Welding ◽  
Filler Metal ◽  
Gas Tungsten Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Bend Strength ◽  
Gas Tungsten Arc ◽  
Precision Alloys

Abstract Invar M93T is the filler metal developed for the welding of Invar M93 tubes by plasma arc welding (PAW) or gas tungsten arc welding (GTAW). This datasheet provides information on composition, tensile properties, and bend strength as well as fracture toughness. It also includes information on forming and joining. Filing Code: FE-144. Producer or source: Metalimphy Precision Alloys.

Role of welding processes on microstructure and mechanical properties of nuclear grade stainless steel joints

2019 ◽  
Vol 233 (11) ◽  
pp. 2335-2351 ◽  
Author(s):  
R Rajasekaran ◽  
AK Lakshminarayanan ◽  
M Vasudevan ◽  
P Vasantharaja
Keyword(s):  
Stainless Steel ◽  
Base Metal ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Nuclear Grade ◽  
Lower Percentage ◽  
Weld Joints ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Welding Processes

Nuclear grade 316LN austenitic stainless steel weld joints were fabricated using conventional gas tungsten arc welding (GTAW), activated flux gas tungsten arc welding (AGTAW), laser beam welding (LBW) and friction stir welding (FSW) processes. Assessment of weld beads was done by mechanical and metallurgical characterizations. Bead geometry and weld zones were studied by taking macrographs along the transverse side of the weld joints. Metallurgical features of different weld joints were carried out using optical microscopy and scanning electron microscopy. Microhardness distribution across four weld joints was recorded and hardness variations were compared. All weld zone, heat affected zone (HAZ) of GTAW and LBW, thermo-mechanically affected zone (TMAZ) of FSW processes, exhibited higher hardness values than the base metal. Reduced hardness was recorded at HAZ of AGTAW process. This was the result of a considerable grain growth. LBW joint showed the highest hardness value at the center of the fusion zone due to fine equiaxed dendrite morphology. Tensile and impact properties of different welding processes were evaluated and comparisons were made at room temperature. All weld samples displayed high yield strength (YS) and ultimate tensile strength (UTS) with a lower percentage of elongation compared to that of the base metal. FSW joint showed improved YS, UTS and impact toughness compared to other weld joints. This is attributed to the formation of strain-free fine equiaxed grains at stir zone around 5 µm in size with subgrains of 2 µm in size by severe dynamic recrystallization mechanism. Among the fusion welding techniques, AGTAW process exhibited improved toughness, besides almost equal toughness of the base metal due to low δ-Ferrite with high austenite content. Fractography studies of the base metal and different weld samples were carried out by SEM analysis and features were compared.

Plasma Arc Welding for Code Compliance Nuclear Applications

2020 ◽  
Author(s):  
Dongmei (Donna) Sun ◽  
Rob Pistor
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Nuclear Industry ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Hot Wire ◽  
Weld Overlay ◽  
Nuclear Component ◽  
Wire Feeding ◽  
Code Compliance

Abstract Plasma Arc Welding (PAW) has been used for many critical applications due to its flexibility, reliability and high weld quality. In this paper, two code compliance plasma arc welding applications in the nuclear industry are discussed. The first application is an innovative welding process using PAW with specially designed dual hot wire feeding system, namely Dual Hot Wire Gas Metal Plasma Arc Welding (GMPAW). The GMPAW process offers unique advantages for high deposition and low dilution weld overlay application. The second application is a remote weld overlay repair from pipe inside diameter (ID) for a highly radiated nuclear component using PAW process with remote machining and NDE capability. In this paper, the benefits and advantages are provided for the aforementioned PAW applications. The versatility of plasma arc welding system configuration, as well as high quality and productivity can make plasma arc welding a good candidate for many critical code compliance applications.

Effect of Mechanical Properties and Corrosion Behaviour of Martensitic Stainless Steel 410 1.6mm Butt Welded by Plasma Arc Welding

2019 ◽  
Vol 969 ◽  
pp. 601-606
Author(s):  
M. Sree Arravind ◽  
S. Ramesh Kumar ◽  
S. Senthil Kumaran ◽  
D. Venkateswarlu
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Tensile Test ◽  
Arc Welding ◽  
Martensitic Stainless Steel ◽  
Laser Beam Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Butt Weld ◽  
Welding Processes

Plasma Arc Welding (PAW) is one of the important arc welding processes used in electronics, medical, automotive and aerospace industries due its high accuracy and ability of welding any hard materials which is more tolerant to joint misalignment than Laser Beam Welding (LBW) at a lower cost. Thickness of 1.6mm plates were used to obtain full penetration and a strong joint with a very narrow Heat Affected Zone. The present study deals with the effect of mechanical and corrosion resistance properties of butt welded 1.6 mm thick martensitic stainless steel-similar (SS410 and SS410) joints made by plasma arc welding technique. Similar butt Welded joints were analyzed by using mechanical (Bend test, Erichsen cup test, Tensile test) characterization methods. Their corresponding corrosion resistance properties were also investigated by potentiodynamic polarization corrosion testing technique. The tensile strength was found to be 341 MPa for similar SS410 weld. During tensile test the failure occurred on the base metal on both similar joints Keywords: SS304; SS410; PAW; Butt weld; Erichsen Cup Test; Microstructure.

Sign in / Sign up

Export Citation Format

Share Document