Effect of pulse energy on microstructure and properties of laser lap-welding Hastelloy C-276 and 304 stainless steel dissimilar metals

304 stainless steel test block was fabricated by continuous melting wire with CMT and pulse mixed mode, and the path of additive manufacturing is layered slice S-shaped. The relationship between microstructure and properties of the specimen was investigated by microscope, SEM, EBSD, XRD, tensile, impact and electrochemical experiments. The results show that molding between weld and weld is very good, and the microstructure is mainly Austenite, Ferrite and a little of σ, and there are three kinds of Ferrite morphology: cellular, wormlike and lath. σ phase precipitates easily in regions with high ferrite content and is distributed at the boundary between austenite and ferrite. The specimen has good low temperature toughness. The microscopic fracture surface is mainly dimple, and the precipitates in the fracture surface are mainly fine carbide particles. The tensile strength of the additive manufacturing 304 specimen is higher than the forged specimen, and the type of fracture is ductile fracture. The electrochemical analysis of 304 stainless steel specimens and forgings shows that CMT and pulse arc additive manufacturing specimen has excellent corrosion resistance and its corrosion current is slightly lower than the forging.

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Microstructure and properties of transient liquid phase bonding of AM60 Mg alloy to 304 stainless steel with Zn interlayer

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2018.11.031 ◽

2019 ◽

Vol 266 ◽

pp. 558-568 ◽

Cited By ~ 3

Author(s):

Milad Mehrzad ◽

Alireza Sadeghi ◽

Mohammadreza Farahani

Keyword(s):

Stainless Steel ◽

Liquid Phase ◽

Transient Liquid Phase ◽

Mg Alloy ◽

304 Stainless Steel ◽

Transient Liquid Phase Bonding ◽

Microstructure And Properties

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Influence of High-Frequency Micro-Forging on Microstructure and Properties of 304 Stainless Steel Fabricated by Laser Rapid Prototyping

steel research international ◽

10.1002/srin.201200259 ◽

2013 ◽

Vol 84 (9) ◽

pp. 870-877 ◽

Cited By ~ 7

Author(s):

Yan Zhang ◽

Chang Jun Qiu ◽

Yong Chen ◽

Jinshui Yu ◽

Ju Zhou ◽

...

Keyword(s):

Stainless Steel ◽

Rapid Prototyping ◽

High Frequency ◽

304 Stainless Steel ◽

Microstructure And Properties

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Study on Laser Welding of Phone Nuts

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.815.778 ◽

2013 ◽

Vol 815 ◽

pp. 778-781

Author(s):

Xiao Hong Wu

Keyword(s):

Tensile Strength ◽

Stainless Steel ◽

Laser Pulse ◽

Laser Welding ◽

Pulse Energy ◽

Pulse Width ◽

Peak Power ◽

Laser Pulse Energy ◽

304 Stainless Steel ◽

Power Pulse

Used YAG pulse laser to weld 304 stainless steel nuts, studied about the parameters such as peak power, pulse width, defocus distance impacting on the performance of the joints welded by laser. The studies showed that the tensile strength and torque of the nuts increased as the peak power and the pulse width increased.Burn through in welding easy occur when laser pulse energy is too big, pulse width is too wide or defocus distance is too low.

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Investigation of Microstructure and Corrosion Resistance of Dissimilar Welded Joint between 304 Stainless Steel and Pure Copper

Budapest International Research in Exact Sciences (BirEx) Journal ◽

10.33258/birex.v1i3.382 ◽

2019 ◽

Vol 1 (3) ◽

pp. 76-82

Author(s):

Sorush Niknamian

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Arc Welding ◽

Pure Copper ◽

Welding Process ◽

Steel Part ◽

304 Stainless Steel ◽

Dissimilar Metals ◽

304L Stainless Steel ◽

Shielded Metal Arc Welding

Nowadays, welding of dissimilar metals has become significant. In this process, a number of parameters including but not limited to type of electrode, amount of current, preheating temperature, and welding rate, that are essential to be taken into account. For welding of dissimilar metals, various methods are exploited including shielded metal arc welding (SMAW) and gas tungsten arc welding (GTAW). The stimulus for studying welding of 304L stainless steel to pure copper originates from difficulties in joining copper parts of water-circulating molds to their steel part. In this study, the welding is performed on plates of steel and copper using SMAW, GTAW and combined SMAW+GTAW welding methods with EL-CuMn2, ENiCrMo-6 and ER70S-4 electrodes. In order to investigate the microstructure and corrosion resistance behavior of welds, the samples were characterized using microstructural study and polarization test. It was observed that among all four welding methods, only combined SMAW+GTAW welding process resulted in successful joint between 304L stainless steel and copper. Both obtained joints possess suitable microstructure and corrosion resistance.

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