Steel Welding with Micro-Jet Injector

2014 ◽  
Vol 1036 ◽  
pp. 440-445
Author(s):  
Tomasz Węgrzyn ◽  
Jan Piwnik ◽  
Izabela Horzela ◽  
Wojciech Majewski
Keyword(s):  
Impact Toughness ◽  
Mild Steel ◽  
Weld Metal ◽  
Acicular Ferrite ◽  
Mig Welding ◽  
Jet Cooling ◽  
Welding Technology ◽  
Metal Deposit ◽  
Mild Steel Welding ◽  
Very High

The article focuses on mild steel welding and covers the new possibilities of that method. Since 2011 innovate welding technology based on micro-jet cooling just after welding is being checked. Weld metal deposit (WMD) was carried out for standard MIG welding and for new welding method with micro-jet cooling. A very high percentage of acicular ferrite (AF) in WMD was gettable (55-75%) for low alloy welding with micro-jet cooling injector. This beneficial structure (very high amount of AF) is unusual to observe in WMD in other welding methods. This method is very promising mainly due to the significant improvement of weld quality and reduces costs. Furthermore impact toughness and strengths of WMD were carried out. The present paper aims at outlining same of the recent innovations in MIG welding which represent steps ahead to achieve the objectives outlined above.

Structure and Properties of Steel Welding after Micro-Jet Cooling Process

2016 ◽  
Vol 246 ◽  
pp. 231-234
Author(s):  
Iwona Bednarczyk ◽  
Bożena Szczucka-Lasota ◽  
Tomasz Węgrzyn ◽  
Jan Piwnik
Keyword(s):  
Impact Toughness ◽  
Weld Metal ◽  
Acicular Ferrite ◽  
Structure And Properties ◽  
Cooling Process ◽  
Mechanical Structure ◽  
Jet Cooling ◽  
Metal Deposit ◽  
Very High

Welding with micro-jet cooling is an innovate technology. It is possible to get structure of weld metal deposit (WMD) with a very high amount of acicular ferrite (on the level of 70 %) that is not valuable for other processes. It corresponds with good impact toughness of weld. In the paper parameters of micro-jet cooling and mechanical structure of weld will be present and compared with welding without micro-jet cooling. Results of investigation are very optimistic. That technology should be treated for welding of other materials.

scholarly journals The Use of Compressed Air for Micro-Jet Cooling After MIG Welding

2016 ◽  
Vol 61 (3) ◽  
pp. 1405-1408
Author(s):  
D. Hadryś ◽  
T. Węgrzyn ◽  
J. Piwnik ◽  
Z. Stanik ◽  
W. Tarasiuk
Keyword(s):  
Weld Metal ◽  
Acicular Ferrite ◽  
Compressed Air ◽  
Steel Weld ◽  
Low Alloy Steel ◽  
Mig Welding ◽  
Jet Cooling ◽  
Metal Deposit ◽  
Steel Weld Metal ◽  
First Time

AbstractThe material selected for this investigation was low alloy steel weld metal deposit (WMD) after MIG welding with micro-jet cooling. The present investigation was aimed as the following tasks: obtained WMD with various amount of acicular ferrite and further analyze impact toughness of WMD in terms of acicular ferrite amount in it. Weld metal deposit (WMD) was first time carried out for MIG welding with micro-jet cooling of compressed air and gas mixture of argon and air. Until that moment only argon, helium and nitrogen were tested as micro-jet gases for MIG/MAG processes. An important role in the interpretation of the results can give methods of artificial intelligence.

Oxygen in Steel WMD after Welding with Micro-Jet Cooling

2013 ◽  
Vol 58 (4) ◽  
pp. 1067-1070 ◽  
Author(s):  
T. Wegrzyn ◽  
J. Piwnik ◽  
D. Hadrys
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Welding Process ◽  
Mag Welding ◽  
Mig Welding ◽  
Metallographic Structure ◽  
Jet Cooling ◽  
Welding Technology ◽  
Metal Deposit ◽  
Steel Welds

Abstract Until that moment micro-jet technology was tested only for MIG welding process with argon as a shielded gas. An article presents actual information about innovate welding technology with micro-jet cooling. There are put down information about gases that could be chosen both for MIG/MAG welding and for micro-jet process. There were given information about influence of various micro-jet gases on metallographic structure of steel welds. Mechanical properties of weld was presented in terms of oxygen amount in WMD (weld metal deposit).

scholarly journals Mechanical Properties of Plug Welds after Micro-Jet Cooling

2016 ◽  
Vol 61 (4) ◽  
pp. 1771-1776 ◽  
Author(s):  
D. Hadryś
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Weld Joint ◽  
Welded Joint ◽  
New Technology ◽  
Mig Welding ◽  
Jet Streams ◽  
Welding Method ◽  
Jet Cooling ◽  
Metal Deposit

Abstract New technology of micro-jet welding could be regarded as a new way to improve mechanical properties of plug welds. The main purpose of that paper was analyzing of mechanical properties of plug welds made by MIG welding method with micro-jet cooling. The main way for it was comparison of plug welds made by MIG welding method with micro-jet cooling and plug welds made by ordinary MIG welding method. It is interesting for steel because higher amount of acicular ferrite (AF) in weld metal deposit (WMD) is obtained in MIG welding method with micro-jet cooling in relation to ordinary MIG welding method. This article presents the influence of the cooling medium and the number of micro-jet streams on mechanical properties of the welded joint. Mechanical properties were described by force which is necessary to destroy weld joint.

scholarly journals Impact Toughness of Steel WMD After TIG Welding

2017 ◽  
Vol 62 (3) ◽  
pp. 1647-1650
Author(s):  
T. Węgrzyn ◽  
J. Piwnik ◽  
Z. Stanik ◽  
D. Węgrzyn ◽  
D. Sieteski
Keyword(s):  
Artificial Intelligence ◽  
Impact Toughness ◽  
Weld Metal ◽  
Alloy Steel ◽  
Gas Mixtures ◽  
Tig Welding ◽  
Low Alloy Steel ◽  
Jet Cooling ◽  
Metal Deposit ◽  
Alloy Weld

AbstractThe material selected for this investigation was low alloy weld metal deposit after TIG welding with various amount of oxygen in weld metal deposit (WMD). After TIG process it is difficult to get proper amount of oxygen in WMD on the level much lower than 350 ppm. The highest impact toughness of low alloy WMD corresponds with the amount of oxygen in WMD above 350 ppm. In the paper focuses on low alloy steel after innovate welding method with micro-jet cooling that could be treated as a chance on rising amount of oxygen in weld. Weld metal deposit (WMD) was carried out for TIG welding with micro-jet cooling with various amount of oxygen in WMD. In that paper various gas mixtures (gas mixtures Ar-O2and Ar-CO2) were tested for micro-jet cooling after TIG welding. An important role in the interpretation of the results can give methods of artificial intelligence.

scholarly journals Nitrogen And Oxygen Amount In Weld After Welding With Micro-Jet Cooling

2015 ◽  
Vol 60 (2) ◽  
pp. 657-660
Author(s):  
T. Węgrzyn ◽  
J. Piwnik
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Welding Process ◽  
Mag Welding ◽  
Mig Welding ◽  
Metallographic Structure ◽  
Jet Cooling ◽  
Metal Deposit ◽  
Steel Welds

AbstractMicro-jet cooling after welding was tested only for MIG welding process with argon, helium and nitrogen as a shielded gases. A paper presents a piece of information about nitrogen and oxygen in weld after micro-jet cooling. There are put down information about gases that could be chosen both for MIG/MAG welding and for micro-jet process. There were given main information about influence of various micro-jet gases on metallographic structure of steel welds. Mechanical properties of weld was presented in terms of nitrogen and oxygen amount in WMD (weld metal deposit).

Control over the steel welding structure parameters by micro-jet cooling

2012 ◽  
Vol 57 (3) ◽  
pp. 679-685 ◽  
Author(s):  
T. Wegrzyn ◽  
J. Piwnik ◽  
R. Wieszała ◽  
D. Hadrys
Keyword(s):  
Weld Metal ◽  
Innovative Technology ◽  
Structure Parameters ◽  
Mig Welding ◽  
Jet Cooling ◽  
Hole Geometry

The paper presents the characteristics of innovative technology of micro-jet cooling in MIG welding (according to PN-EN ISO 4063:2009). Presented results received at different jet hole geometry and various coolant pressure. This technology allows get, with appropriately selected parameters of cooling increased ferrite AF content in weld metal, up to 14% for standard MIG technology. This structure proves toughness, especially at temperature -40°C.

scholarly journals Steel Weld Metal Deposit Measured Properties after Immediate Micro-Jet Cooling

Metals ◽  
2017 ◽  
Vol 7 (9) ◽  
pp. 339 ◽  
Author(s):  
Bożena Szczucka-Lasota ◽  
Bożena Gajdzik ◽  
Tomasz Węgrzyn ◽  
Łukasz Wszołek
Keyword(s):  
Weld Metal ◽  
Steel Weld ◽  
Jet Cooling ◽  
Metal Deposit ◽  
Steel Weld Metal

scholarly journals Plastic Properties of Fine-Grained WMD After Micro-Jet Cooling

2014 ◽  
Vol 59 (3) ◽  
pp. 919-923 ◽  
Author(s):  
D. Hadryś ◽  
T. Węgrzyn ◽  
J. Piwnik
Keyword(s):  
Weld Metal ◽  
Coefficient Of Restitution ◽  
Plastic Properties ◽  
Fine Grained ◽  
Jet Cooling ◽  
Innovative Method ◽  
Metal Deposit ◽  
Forced Cooling ◽  
The Relationship ◽  
Favorable Structure

Abstract Micro-jet welding is an innovative method of weld forced cooling immediately after welding. It allows to obtain weld with superior properties in comparison to conventional welding. The reason for this is to obtain a more favorable structure of the weld metal deposit (WMD) with much higher amount of acicular ferrite (AF). Different structures and mechanical properties of weld metal deposit were obtained by using various gases for cooling. The paper shows the relationship between the type of gas for micro-jet cooling and plastic properties of the weld joint. Coefficient of restitution and plastic strain were selected to describe changes of weld plastic properties for different micro-jet cooling gases. The tests were performed in dynamic conditions (impact).

scholarly journals The influence of the oxygen equivalent in a gas-mixture on the structure and toughness of microalloyed steel weldments

2006 ◽  
Vol 71 (3) ◽  
pp. 313-321 ◽  
Author(s):  
Radica Prokic-Cvetkovic ◽  
Andjelka Milosavljevic ◽  
Aleksandar Sedmak ◽  
Olivera Popovic
Keyword(s):  
Impact Toughness ◽  
Crack Propagation ◽  
Weld Metal ◽  
Acicular Ferrite ◽  
Microalloyed Steel ◽  
Gas Mixtures ◽  
Gas Mixture ◽  
Weld Metals ◽  
Maximum Crack ◽  
The Impact

Testing were carried out on two steels. The first was microalloyed with Nb and second with Ti, Nb and V. The impact toughness of weld metals of these steels was evaluated using an instrumented Charpy pendulum. Five different gas mixtures (Ar, CO2, O2) were used to determine the optimal gas shielded metal arc process for both steels. The oxygen equivalent was used as a representative parameter of a mixture to follow, in particularly, its effect on the microstructure, toughness and crack propagation energy of the weld metal. For these investigated steels, the optimum gas mixture was established (5%CO2, 0.91%O2, balance Ar), which provided the maximum crack propagation energy, due to the microstructure which consisted dominantly of acicular ferrite.

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