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Optimization of the microstructure and mechanical ...

1/1/2020· The continuous-wave keyhole laser weld of 21-6-9 stainless steel had the lowest porosity level in four materials of 21-6-9 stainless steel, A36 steel, 304 L stainless steel and pure nickel. Because this stainless steel has high content of manganese, which contributes to the dissolution of nitrogen and the stability of the keyhole [ 12 ].

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WELDING OF STAINLESS STEELS AND OTHER JOINING METHODS

changes that take place, the principal objective in welding stainless steels is to provide a sound joint with qualities equal to or better than those of the base metal, allowing for any metallurgical changes that take place in the base metal adjacent to the weld and any differences in the weld filler metal.

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Influence of residual oxygen on the welding result

INFLUENCE OF RESIDUAL OXYGEN ON THE WELDING RESULT by J. Vagn Hansen, M.Sc.mech.eng. ... Although primarily focusing on the weld metal a series of 7 photos showing different quality of purging have been produced for reference. Summary To exploit the full benefits of corrosion resistance of a stainless steel alloy even in the weld zones, heat ...

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Effect of Electrode Types on the Solidification Cracking ...

The effect of electrode types on the solidification cracking susceptibility of austenitic stainless steel weld metal was studied. Manual metal arc welding method was used to produce the joints with the tungsten inert gas welding serving as the control. Metallographic and chemical analyses of the fusion zones of the joints were conducted. Results indicate that weldments produced from E 308-16 ...

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(PDF) Welding of Duplex Stainless Steel | IJSRD ...

This observation is Fig 5: Weld 2-HAZ microstructure of cap bead. probably linked to the welding arc restriction with increasing chamber pressure (water depth), as the case (O. M. Akselsen, H. Fostervoll, and C. H. Ahlen, when going from weld deposition of Weld 1 at 12 bar to Hyperbaric GMA Welding of Duplex Stainless Steel at 12 Weld 2 at 35 bar.

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Theoretical approach to influence of nitrogen on ...

10/23/2018· The effect of nitrogen on the solidification cracking susceptibility of austenitic stainless steels (SUS316L and SUS310S) was quantitatively evaluated by transverse-Varestraint test. The amount of nitrogen in Ar shielding gas during GTA melt-run welding was varied in order to vary the nitrogen content in the weld metals.

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Influence of welding parameters on nitrogen content in ...

High nitrogen stainless steel with nitrogen content of 0.75% was welded by gas metal arc welding with Ar-N2-O2 ternary shielding gas. The effect of the ternary shielding gas on the retention and ...

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Nitrogen - SmarterCMS602DV

Nitrogen is utilized as a purge gas with stainless steel tube welding as well as a controlled addition for shielding gases utilized to GMAW (gas metal arc weld) of austenitic and duplex grades of stainless steel. Nitrogen can enhance plasma cutting, food processing, inerting and heat-treating operations.

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Influence of Nitrogen Gas of Three Different Procedures .

The use of the same kind of gases on shielding and backing is usual. If no nitrogen is present in the gas mixtures there may be loss of nitrogen from the weld metal or HAZ. Three different welding procedures were tested for a 2% tungsten superduplex parent metal to verify the loss of nitrogen from weld metal .

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Influence of the welding current intensity and nitrogen ...

On the other hand, with the increase in the welding current intensity, diffusion of nitrogen from the weld metal into the HAZ is facilitated, which contributes to the increased HAZ resistance to pitting corrosion. Possible mechanisms for increasing the HAZ resistance to pitting corrosion in the presence of nitrogen are also considered.

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THE EFFECT OF SHIELDING GASES ON MECHANICAL PROPERTIES .

measured chemical composition of the weld metal is listed in Table 3. It is observed that there is great influence of shielding gases on weld metal composition which further becomes responsible for ferrite content in weld metal. As seen from the table, carbon and nickel content in the weld metal increase with increase in the CO 2 content of the ...

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Influence of Nitrogen Gas of Three Different Procedures .

The use of the same kind of gases on shielding and backing is usual. If no nitrogen is present in the gas mixtures there may be loss of nitrogen from the weld metal or HAZ. Three different welding procedures were tested for a 2% tungsten superduplex parent metal to verify the loss of nitrogen from weld metal .

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Influence of the welding current intensity and nitrogen ...

The sensitization degree of the HAZ is thus increased and the formation of pits easier. On the other hand, with the increase in the welding current intensity, diffusion of nitrogen from the weld metal into the HAZ is facilitated, which contributes to the increased HAZ resistance to pitting corrosion.

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Effects of shielding gas composition on the welding ...

8/10/2018· This paper deals with laser-arc hybrid welding of high nitrogen stainless steel (HNS) with 1.2 mm diameter of austenitic stainless steel (ASS) filler wire. The welding was carried out with different shielding gas mixtures like Ar, 95%Ar + 5%N 2, 90%Ar + 10%N 2, 94%Ar + 5%N 2 + 1%O 2 and 89%Ar + 10%N 2 + 1%O 2 .

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Welding - Fumes And Gases : OSH Answers

Stainless steel, Inconel, Monel, Hastelloy and other high-alloy materials, welding rods and plated steel. Acute effect is irritation of the eyes, nose and throat. Increased cancer risk has been noted in occupations other than welding. Also associated with dermatitis and lung problems. Vanadium: Some steel alloys, iron, stainless steel, nickel ...

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Colors in welds and what they mean - The Fabricator

On stainless steel, for example, any color in the weld or HAZ shows that an oxide layer has formed, which can affect corrosion resistance. The darker the color is, the thicker the oxidization. The colors follow a predictable pattern, from chrome to straw to gold to blue to purple.

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The Microstructure and Mechanical Properties of Multi ...

To solve these issues, Hertzman studied the effect of nitrogen on the microstructure and properties of austenitic stainless steel and observed that the nitrogen loss of weld pools was avoided by controlling the shielding gas nitrogen content in tungsten inert gas (TIG) welding. However, nitrogen addition results in the presence of nitrides.

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Welding - Fumes And Gases : OSH Answers

Stainless steel, Inconel, Monel, Hastelloy and other high-alloy materials, welding rods and plated steel. Acute effect is irritation of the eyes, nose and throat. Increased cancer risk has been noted in occupations other than welding. Also associated with dermatitis and lung problems. Vanadium: Some steel alloys, iron, stainless steel, nickel ...

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Influence of nitrogen in the shielding gas on corrosion ...

Abstract. The influence of nitrogen in shielding gas on the corrosion resistance of welds of a duplex stainless steel (grade U-50), obtained by gas tungsten arc (GTA) with filler wire, autogenous GTA (bead-on-plate), electron beam welding (EBW), and microplasma techniques, has been evaluated in chloride solutions at 30 C. Pitting attack has been observed in GTA, electron beam welding, and ...

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Microstructure of Steel Welds - Harry Bhadeshia

In situations where the weld is diluted by the parent plate, the composition of the plate must also influence the nitrogen concentration in the weld. Although the concentration of nitrogen is generally kept rather small ( -120 p.p.m.) it is known to have a potent detrimental effect on the toughness of the weld.

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Nitrogen Addition to the Shielding Gas for Welding Hyper ...

2. Materials and Methods. The material used for this work was hyper-duplex tubes with 19.05 mm in diameter and 2.24 mm in thickness. Those tubes were welded in our laboratory in an automated manner using the gas tungsten arc welding (GTAW) process, using a heat input of 0.15 kJ/mm and a shielding gas composed of Ar + N 2 with different contents of commercially standard N 2, 1.5%, 2.5% ...

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Effect of welding parameters variation on the .

gen on the Microstructure and Stress Corrosion Cracking of Stainless Steel Weld Metals" Welding Research Supplement, 1979, 83-90. [4] R. K. Okagawa, R.D.Dixon, and D.L .Olson "The Influence of Nitrogen from Welding on Stainless Steel Weld Metal Micro- structures", Welding Research Supplement, 1983, 204-209.

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QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

Nitrogen Absorption Phenomenon of GTA Welding with Nitrogen Mixed Shielding Gases - Effect of Plasma Characteristics on Nitrogen Content in GTA Welded Metal - Shinji KODAMA, Kazuki SUGIURA, Shota NAKANISHI, Yoshihiro TSUJIMURA, Manabu TANAKA, Anthony B. MURPHY

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Effects of shielding gas composition on the welding ...

8/10/2018· This paper deals with laser-arc hybrid welding of high nitrogen stainless steel (HNS) with 1.2 mm diameter of austenitic stainless steel (ASS) filler wire. The welding was carried out with different shielding gas mixtures like Ar, 95%Ar + 5%N 2, 90%Ar + 10%N 2, 94%Ar + 5%N 2 + 1%O 2 and 89%Ar + 10%N 2 + 1%O 2 .

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Influence of residual oxygen on the welding result

INFLUENCE OF RESIDUAL OXYGEN ON THE WELDING RESULT by J. Vagn Hansen, M.Sc.mech.eng. ... Although primarily focusing on the weld metal a series of 7 photos showing different quality of purging have been produced for reference. Summary To exploit the full benefits of corrosion resistance of a stainless steel alloy even in the weld zones, heat ...

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The influence of nitrogen on microstructure and .

Nitrogen is added to many of the modem stainless steels because of its favourable effects on both strength and corrosion resistance. This implies that the welding procedure must consider the risk of nitrogen escape from the weld pool. Avoiding nitrogen losses may be accomplished by applying e.g. nitrogen-containing shielding gas.

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The Welding of Stainless Steels - Safe Food Factory

YAG lasers are preferred for welding thin stainless steel sheets (< 1.5 mm) in the pulsed mode. So-called CO 2 lasers are better adapted for the welding of thicker stainless steel sheets or strips (1.5 to 6.0 mm). As in high frequency induction welding (HFIW), this process is widely used for the production of longitudinally welded tubes.

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Influence of the welding current intensity and nitrogen ...

The sensitization degree of the HAZ is thus increased and the formation of pits easier. On the other hand, with the increase in the welding current intensity, diffusion of nitrogen from the weld metal into the HAZ is facilitated, which contributes to the increased HAZ resistance to pitting corrosion.

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Laser Beam Welding of Austenitic Stainless Steels ...

Influence of welding speed on weld depth/width ratio of types 304L and 316L stainless steels. Figure 5. A cross section of type 304L stainless steel weld made using P=3kW, S=2m/min, D d=0.0mm. At high welding speed, attenuation of beam energy by plasma is less significant. This results in relatively more exposure of the laser beam on the sample ...

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Theoretical approach to influence of nitrogen on ...

10/23/2018· The effect of nitrogen on the solidification cracking susceptibility of austenitic stainless steels (SUS316L and SUS310S) was quantitatively evaluated by transverse-Varestraint test. The amount of nitrogen in Ar shielding gas during GTA melt-run welding was varied in order to vary the nitrogen content in the weld metals.

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CiNii - Porosity and Nitrogen Content of Weld Metal .

Some problems such as nitrogen desorption and pores always occur in the weld metal during welding of high nitrogen steel. In order to study the nitrogen content and porosity of the weld metal of high nitrogen steel 1Cr22Mn16N, the steel was welded by CO2 laser welding, and the influence of the shielding gas composition and heat input on the nitrogen content and porosity of the weld ...

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MIG Welding Stainless Steel - lincolnelectric

The shielding gas recommended for short-circuiting welding of stainless-steel contains 90% helium, 7.5% argon, and 2.5% carbon dioxide. The gas gives the most desirable bead contour while keeping the CO2 level low enough so that it does not influence the corrosion resistance of the metal.

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