GMAW Welding of MPM Sheets in Active Gas

2016 ◽  
Vol 1138 ◽  
pp. 75-78
Author(s):  
Sebastian Balos ◽  
Miroslav Dramicanin ◽  
Danka Labus ◽  
Petar Janjatovic ◽  
Leposava Sidjanin
Keyword(s):  
Sheet Metal ◽  
Low Cost ◽  
Gas Metal Arc Welding ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Butt Welds ◽  
High Productivity ◽  
Steel Sheets ◽  
Metal Arc Welding ◽  
Structural Sheet

MPM sheets represent the sanwich panels consisted of two low carbon steel sheets 3 mm thick separated by a visco-elastic inner layer. It is used for dampening the structure borne sound and it replaces the structural sheet metal without taking up a considerable amount of space. The inner layer, however, makes the welding more difficult, since it burns when exposed to relatively high welding temperatures. This may cause distorsion and separation of sheet metal, as well as the loss in sound dampening properties. Therefore, it is of utmost importance that the visco-elastic inner layer remains intact as much as possible, while still maintaining a low cost and a high productivity during welding of MPM sheet housing of large industrial electric motors and generators. In this paper, gas metal arc welding (GMAW) with CO2 active gas was used in an attempt to produce suitable butt welds, welded from both sides. To prevent distorsion and burning of inner layer different butt welds were tested. Different combinations of the following welds were tested: open square weld, combined open square weld on one sheet and single V on the other side, welding in one pass on each side and welding in multiple bead segments on each side. It was found that in all cases, a full penetration was achieved. Furthermore, inner layer thickness near the weld and potential distorsion strongly depend on the welding methodology used.

scholarly journals Analysis of the Wall Geometry with Different Strategies for High Deposition Wire Arc Additive Manufacturing of Mild Steel

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 892 ◽  
Author(s):  
Eider Aldalur ◽  
Fernando Veiga ◽  
Alfredo Suárez ◽  
Jon Bilbao ◽  
Aitzol Lamikiz
Keyword(s):  
Additive Manufacturing ◽  
Gas Metal Arc Welding ◽  
Low Carbon Steel ◽  
Utilization Rate ◽  
High Deposition Rate ◽  
Low Carbon ◽  
Metal Arc Welding ◽  
Geometric Precision ◽  
Directed Energy ◽  
Wire Arc Additive Manufacturing

Additive manufacturing has gained relevance in recent decades as an alternative to the manufacture of metal parts. Among the additive technologies, those that are classified as Directed Energy Deposition (DED) are characterized by their high deposition rate, noticeably, Wire Arc Additive Manufacturing (WAAM). However, having the inability to produce parts with acceptable final surface quality and high geometric precision is to be considered an important disadvantage in this process. In this paper, different torch trajectory strategies (oscillatory motion and overlap) in the fabrication of low carbon steel walls will be compared using Gas Metal Arc Welding (GMAW)-based WAAM technology. The comparison is done with a study of the mechanical and microstructural characteristics of the produced walls and finally, addressing the productivity obtained utilizing each strategy. The oscillation strategy shows better results, regarding the utilization rate of deposited material and the flatness of the upper surface, this being advantageous for subsequent machining steps.

Effect of Shielding Gas Mixture on Gas Metal Arc Welding (GMAW) of Low Carbon Steel (LR Grade A)

2016 ◽  
Vol 705 ◽  
pp. 250-254 ◽  
Author(s):  
Yustiasih Purwaningrum ◽  
Triyono ◽  
M. Wirawan Pu ◽  
Fandi Alfarizi
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Carbon Steel ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Shielding Gas ◽  
Weld Metals ◽  
Metal Arc Welding

The aimed of this research is to determine the feasibility and effect of the mixture of the shielding gas in the physical and mechanical properties. Low carbon steel LR grade A in a thickness 12 mm were joined in butt joint types using GMAW (Gas Metal Arc Welding) with groove’s gap 5 mm and groove angle’s 400 with variation of shielding gas composition. The composition of shielding gas that used were 100% Ar, 100 % CO2 and 50% Ar + 50 % CO2. The measured of mechanical properties with regard to strength, hardness and toughness using, tensile test, bending test, Vickers hardness Test, and Charpy impact test respectively. The physical properties examined with optical microscope. Results show that tensile strength of welding metals are higher than raw materials. Welds metal with mixing Ar + CO shielding gas has the highest tensile strength. Hardness of weld metals with the shielding gas 100% Ar, 100 % CO2 and 50% Ar + 50 % CO2 are 244.9; 209.4; and 209.4 VHN respectively. The temperature of Charpy test was varied to find the transition temperature of the materials. The temperature that used were –60°C, -40°C, -20°C, 0°C, 20°C , and room temperature. Weld metals with various shielding gas have similar trends of toughness flux that was corellated with the microstructure of weld .

scholarly journals An Investigation of the Shearing Forces Using Blanked Carbon Steel Sheets

2019 ◽  
Vol 22 (2) ◽  
pp. 131-135
Author(s):  
Ahmad Saad Jasim ◽  
Ali Abbar Khleif
Keyword(s):  
Carbon Steel ◽  
Sheet Metal ◽  
Low Carbon Steel ◽  
Hydraulic Press ◽  
Shear Angle ◽  
Low Carbon ◽  
Steel Sheets ◽  
Die Set ◽  
Important Challenge ◽  
Punch Geometry

An important challenge confronted when using blanking to machine sheet metal is the treatment of the shearing force in demand for great strength and heavy stock. One of the methods used to decrease the force wanted is the increase of a punch shear angle. In this work, experiments were conducted to study the effect of shear angle for blank has a diameter (50 mm) on shear force of a low carbon steel sheet (AISI 1008). Low carbon steel is a very common material used in fabrication of sheet metal components, with thickness of (0.5 mm). Tools used in the blanking tests were one traditional flat end punch and four different bevel sheared rooftop punches, which rooftop punches were compared to. and it (0°, 5°, 10°, 15°, 20°) a punches diameter (49.95 mm) by clearance (0.025mm) for each side , with a blanking speed (500mm/min). A special blanking die set is designed and manufactured and was a blank cut by a hydraulic press whose capacity (20 ton). The results showed that the blanking forces of (AISI 1008) low carbon steel metal could be decreased radically with best bevel punch geometry. Using (10°) shear angle at the punch end, the cutting forces decreased up to (90%) compared to the ones of the traditional flat end tool

Distortion Analysis on Multipassed Butt Weld Using FEM and Experimental Study

2011 ◽  
Vol 311-313 ◽  
pp. 811-814
Author(s):  
Mohd Ridhwan Mohammed Redza ◽  
Yupiter H.P. Manurung ◽  
Robert Ngendang Ak. Lidam ◽  
Mohd Shahar Sulaiman ◽  
Mohammad Ridzwan Abdul Rahim ◽  
...  
Keyword(s):  
Gas Metal Arc Welding ◽  
Low Carbon Steel ◽  
Welding Process ◽  
Travel Speed ◽  
Source Model ◽  
Low Carbon ◽  
Robotic Welding ◽  
Butt Weld ◽  
Metal Arc Welding ◽  
Weld Distortion

This paper investigates the simulation technique for analyzing the distortion behavior induced by welding process on welded plate which was clamped on one side. This clamping method is intended to enable the investigation of the maximum distortion on the other side. FEA software SYSWELD was employed to predict multipassed butt weld distortion of low carbon steel with thicknesses of 6 mm and 9 mm. The simulation begins with the development of model geometry and meshing type followed by suitable selection of heat source model represented by the Goldak’s double ellipsoid model. Other parameters such as travel speed, heat input, clamping method etc. were determined. The model is dedicated for multipass welding techniques using Gas Metal Arc Welding (GMAW). The experimental works were conducted by using Robotic welding process.

scholarly journals Analysis of Weld Cold Cracking In Excavator Bucket Adapter

2019 ◽  
Vol 269 ◽  
pp. 03009
Author(s):  
Wahidun Adam ◽  
Pratjojo Dewo ◽  
Winarto Winarto
Keyword(s):  
Weld Metal ◽  
Gas Metal Arc Welding ◽  
High Stress ◽  
Low Carbon Steel ◽  
Slag Inclusion ◽  
Cold Cracking ◽  
Carbon Equivalent ◽  
Low Carbon ◽  
Electron Probe Micro Analyzer ◽  
Metal Arc Welding

This paper presents a failure analysis on welding of bucket adapter for an excavator that made of low carbon steel with Ideal Diameter (DI) value 341 and Carbon Equivalent 0.73. The bucket component is stated OK as the final inspection, but four months later found cracked and even it has not been used yet. Adapter mounted to bucket through CO2 gas shielded Gas Metal Arc Welding (GMAW) process, filler metal MG-50 (AWS A5.18 ER70S-G), pre-heating and post-heating. Crack occurred on the boundary of weld metal and adapter casting. The metallurgical examination was conducted in the crack origin and the adapter casting. Nondestructive test (NDT) covered visual and magnetic test (MT), while destructive test (DT) covered fractography, mechanical properties, and Electron Probe Micro Analyzer (EPMA). The investigation resulted in that crack initiated from slag inclusion in the weld metal due to insufficient cleaning on weld joint. The higher hardness of martensite structure in the heat affected zone (HAZ) of adapter indicates high cooling rate that gen erates high residual stress. High stress that caused by insufficient post heating triggered severe crack propagation. By its characteristic, crack is called the cold cracking, delayed cracking, or hydrogen-induced cracking (HIC).

scholarly journals Double Fillet Welding of Carbon Steel T-Joint by Double Channel Shielding Gas Metal Arc Welding Method Using Metal Cored Wire

2017 ◽  
Vol 62 (2) ◽  
pp. 947-954
Author(s):  
T. Mert ◽  
N. Gultekin ◽  
A. Karaaslan
Keyword(s):  
Carbon Steel ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Shielding Gas ◽  
Cored Wire ◽  
T Joints ◽  
Metal Arc Welding ◽  
Double Channel

AbstractLow carbon steel material and T-joints are frequently used in ship building and steel constructions. Advantages such as high deposition rates, high quality and smooth weld metals and easy automation make cored wires preferable in these industries. In this study, low carbon steel materials with web and flange thicknesses of 6 mm, 8 mm and 10 mm were welded with conventional GMAW and double channel shielding gas metal arc welding (DMAG) method to form double fillet T-joints using metal cored wire. The difference between these two methods were characterized by measurements of mean welding parameters, Vickers hardness profiles, weld bead and HAZ geometry of the joints and thermal camera temperature measurements. When weld bead and HAZ geometries are focused, it was seen filler metal molten area increased and base metal molten area decreased in DMAG of low carbon steel. When compared with traditional GMAW, finer and acicular structures in weld metal and more homogenous and smaller grains in HAZ are obtained with double channel shielding gas metal arc welding.

scholarly journals Effect of Welding Parameters and Electrodes on Bead width using Gas Metal ARC Welding

2019 ◽  
Vol 9 (1) ◽  
pp. 1338-1343
Keyword(s):  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Research Work ◽  
Low Carbon Steel ◽  
Wire Diameter ◽  
Welding Parameters ◽  
Low Carbon ◽  
Mathematical Relationship ◽  
Bead Width ◽  
Metal Arc Welding

In this research work, an attempt has been made to formulate and investigate the effect of GMAW conditions on bead width during the cladding of low carbon steel pale using AISI 308H electrodes. The BoxBehnken design has been employed for the development of mathematical relationship. The voltage, current and wire diameter have been considered as cladding conditions. The variation of bead width with voltage and current have been found non linear while, the effect of wire diameter on bead width has been observed linear. On the other hand, the bead width continuously increases with increase in voltage, current and wire diameter.

scholarly journals Effects of MIG process parameters on the geometry and dilution of the bead in the automatic surfacing

2011 ◽  
Vol 57 (No. 2) ◽  
pp. 56-62 ◽  
Author(s):  
R. Chotěborský ◽  
M. Navrátilová ◽  
P. Hrabě
Keyword(s):  
Arc Welding ◽  
Process Mining ◽  
High Reliability ◽  
Low Cost ◽  
Gas Metal Arc Welding ◽  
Ease Of Use ◽  
Weld Bead ◽  
High Productivity ◽  
Metal Arc Welding ◽  
Natural Choice

Automatic weld surfacing is being employed increasingly in the process, mining and power industries. Gas metal arc welding has become a natural choice for automatic surfacing due to its important properties. These include: high reliability, all positions capabilities, ease of use, low cost and high productivity. With increasing use of gas metal arc welding in its automatic mode, the use of mathematical models to predict the dimensions of the weld bead has become necessary. The development of such mathematical equations using a four factor central factorial technique to predict the geometry of the weld bead in the deposition of OK Tubrodur 15.43 electrode onto structural steel S235JR is discussed. The models developed have been checked for their adequacy and significance by using the F test and the Student’s t test, respectively

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