Dissimilar Metal Welding of Austenite Stainless Steel and Carbon Steel Using Nd:YAG Laser a Continuous Wave

2007 ◽  
Vol 345-346 ◽  
pp. 1445-1448 ◽  
Author(s):  
Ho Jun Shin ◽  
Young Tae Yoo ◽  
Byung Heon Shin ◽  
Ji Hwan Kim
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Nd:Yag Laser ◽  
Continuous Wave ◽  
Practical Importance ◽  
Welding Process ◽  
Austenite Stainless Steel ◽  
Dissimilar Metal ◽  
Dissimilar Metal Welding ◽  
Metal Welding

Dissimilar metal welding (DMW) are used widely in various industrial applications due to the practical importance from the technical and economic aspect. However, DMW have several fabricative and metallurgical drawbacks that can often lead to in-service failures. For example, the most pronounced fabrication faults are hot cracks. Recently, DMW have used the several of heat source to decrease such as faults. Laser welding process has, in recent years, attracted more attention due to its special features: a small heat-affected zone and narrow weld bead due to the low heat input; welding at high speed; welding can be carried out in areas of difficult access; contactless energy transfer; welding in an exact and reproducible manner; possibilities for automation and robotization, and welding performed in various atmospheres. In this paper, the weldability on dissimilar metal welding of austenite stainless steel and carbon steel using Nd:YAG laser with a continuous wave was experimentally investigated.

Characteristics of electrospark deposition of a nickel-based alloy on 410 stainless steel for purpose of facilitating dissimilar metal welding by laser

2016 ◽  
Vol 87 (9-12) ◽  
pp. 2821-2828 ◽  
Author(s):  
Seyed Hamzeh Baghjari ◽  
Farshid Malek Ghaini ◽  
Hamid Reza Shahverdi ◽  
Mohammad Ebrahimnia ◽  
Carlo Mapelli ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Electrospark Deposition ◽  
Dissimilar Metal ◽  
Dissimilar Metal Welding ◽  
Nickel Based Alloy ◽  
Metal Welding

A Study on the Welding Characteristics of Dissimilar Metal Using a High Power CW Nd:YAG Laser

2007 ◽  
Vol 26-28 ◽  
pp. 539-542
Author(s):  
Ho Jun Shin ◽  
Young Tae Yoo ◽  
Byung Heon Shin
Keyword(s):  
Welding Speed ◽  
Nd:Yag Laser ◽  
Continuous Wave ◽  
Research Work ◽  
Welding Process ◽  
Welding Parameters ◽  
Deep Penetration ◽  
Pressurized Water ◽  
Zone Formation ◽  
Dissimilar Metal

Laser welding process is widely used in the industrial field due to its numerous advantages: a small heat affected zone(HAZ), deep penetration, high welding speed, ease of automation, single-pass thick section capability, enhanced design flexibility, and small distortion after welding. In this paper, the laser weldability of Austenite stainless steel and INCONEL600 at dissimilar metal welds using a continuous wave Nd:YAG laser are experimentally investigated. INCONEL600 is being used in a steam generator tubing of pressurized water reactor(PWR) exposed to some corrosion. Therefore stress corrosion cracking can occur on this material. A research work is conducted to determine effects of welding parameters, on eliminating or reducing the extent welding zone formation at dissimilar metal welds and to optimize those parameters that have the most influence parameters such as focus length, laser power and welding speed were tested.

A Residual Stress Analysis of a Corner Crack in Pressurizer Vent Nozzle Penetration Weld

2009 ◽  
Author(s):  
Sang-Min Lee ◽  
Jeong-Soon Park ◽  
Young-Hwan Choi ◽  
Hae-Dong Chung ◽  
Doo-Ho Cho ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Plastic Zone ◽  
Welding Process ◽  
Corner Crack ◽  
Dissimilar Metal ◽  
Dissimilar Metal Welding ◽  
Metal Welding

There are some ferritic low alloy steel components including dissimilar metal welding parts in a nuclear power plant. Residual stress induced by welding process is one of the factors that may lead a sound component to have a defect. Therefore it is necessary that the distribution of residual stress is obtained to predict the behavior of a dissimilar metal welding part. In this paper, the distribution of residual stress obtained by finite element analysis is investigated to assess the stress intensity factor of a corner crack in pressurizer vent nozzle penetration weld. Then the stress intensity factor and plastic zone correction of a corner crack are calculated under internal pressure, thermal stress and residual stress in accordance with Electric Power Research Institute equation [1]. The resulting stress intensity factor and plastic-zone correction were compared with those obtained from Structural Integrity Associates.

Laser Welding Characteristics of Cold Rolled Carbon Steel Utilize Continuous Wave Nd:YAG Laser

2007 ◽  
Vol 345-346 ◽  
pp. 1461-1464 ◽  
Author(s):  
Byung Heon Shin ◽  
Young Tae Yoo ◽  
Ho Jun Shin ◽  
Ji Hwan Kim
Keyword(s):  
Carbon Steel ◽  
Laser Welding ◽  
Nd:Yag Laser ◽  
Laser Power ◽  
Continuous Wave ◽  
Welding Process ◽  
High Energy ◽  
Optimum Conditions ◽  
Cold Rolled ◽  
Laser Welding Process

Laser welding process is widely used in the industrial area due to its less affects to base metal than general welding. Laser welding has characteristics that highly affect ratio, deeply penetration depth and small heat affected zone(HAZ) due to its in a short time melting and then solidification by a high energy absorption rate. The objective of this research work is to investigate the optimum conditions of a cold rolled carbon steel(SCP1) in a laser welding process using a Nd:YAG laser with a continuous wave(CW). The determination of optimum conditions were performed to change the laser power, beam speed, focus length and then carry out an butt welding. From the results of the investigation, it has been shown that the optimal welding condition without defects in the vicinity of the welded area and with a good welding quality is 1325W of the laser power, 1.4m/min of laser welding speed and 0mm of focus position.

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