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Effect on Weld Pool Geometry using Tungten Inert Gas Welding on Stainless Steel 304


Call for Papers Engineering Journal, May 2019

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Effect on Weld Pool Geometry using Tungten Inert Gas Welding on Stainless Steel 304

Effect on Weld Pool Geometry using Tungten Inert Gas Welding on Stainless Steel 304

1Saurav Mukheja,2 R.P.Singh

1, 2 Department of Mechanical Engineering, H.C.T.M. Kaithal

1sauravmukheja8@gmail.com, 2rudrapratapsingp002@gmail.com

Keywords: TIG welding, Stainless Steel, Weld Pool, Optimization.

  1. INTRODUCTION

    Stainless steel is a steel which does not readily corrode or stain with water as ordinary steel does, but despite the name it is not fully stain-proof, most notably under low oxygen, high salinity, or poor circulation environments. It is also called corrosion-resistant steel or CRES .Convective Current is produced on the surface of molten pool of specimen when welding of steel is done due to temperature gradients of surface tension. The shape of weld produced is controlled by the soluble surface-active elements present in the weld puddle. Some surface-active elements like S, O, Se, Te, etc, affects the penetration of the weld. The four main methods for stainless steel welding are I current use

      1. TIG Tungsten inert gas, MIG metal inert gas, MAG metal active gas and MMA manual metal arc methods. In this study the fabrication of SS304 was dne by TIG Welding method and the effect of current and groove angle on weld pool was evaluated.

        Figure1.gas tungsten arc welding(gtaw)

  2. EXPERIMENTAL PROCEDURE

    The chemical composition of Stainless Steel 304 sheet of 6 mm thickness is sown in Table I

    TABLE I

    The chemical composition of Stainless Steel 304 sheet of 6 mm thickness

    SAE

    Designation

    UNS

    Designation

    %Cr

    % Ni

    % C

    %Mn

    304

    S30400

    18-

    8-

    0.08

    2

    20

    10.5

    0

    SAE

    Designation

    UNS

    Designation

    %Si

    % P

    % S

    %N

    304

    S30400

    0.75

    0.045

    0.03

    0.1

    Weld Bead Width

    The graph showing the variation of weld bead width and weld bead height with reference to the number of experiment are shown below.

    Scatterplot of WeldBeadWidthvs Number of Experiment

    8.0

    7.5

    7.0

    6.5

    6.0

    5.5

    5.0

    0 1 2 3 4 5 6 7 8 9

    Number of Experiment

    Figure 2. Scatter plot of Weld Bead Width vs Number of Experiment

    Scatterplot of Weld Bead Height vs Number of Experiment

    1.2

    1.1

    1.0

    0.9

    0.8

    0.7

    0 1 2 3 4 5 6 7 8 9

    Number of Experiment

    Weld Bead Height

    Figure 3. Scatter plot of Weld Bead Height vs Number of Experiment

    The graph analysing the effect of varying current and groove angle on Weld bead Height and representing the effect on Signal-to-Noise ratio and Mean value of SS304 specimen (100*50*5).

    Main Effects Plot for SN ratios

    Data Means

    TABLE II

    Current

    Grove Angle

    Weld bead height

    SNRA1

    Mean

    120

    40

    0.732

    2.70978

    .732

    120

    60

    0.710

    2.97483

    .710

    120

    75

    0.690

    3.22302

    .690

    140

    45

    0.850

    1.41162

    .850

    140

    60

    0.780

    2.15811

    .780

    140

    75

    0.890

    1.01220

    .890

    160

    45

    0.760

    2.38373

    .760

    160

    60

    0.710

    2.97483

    .710

    160

    75

    1.200

    -1.58362

    1.200

    The graph analysing the effect of varying current and groove angle on Weld bead Width and representing the effect on Signal-to-Noise ratio and Mean value of SS304 specimen (100*50*5).

    3.0

    Mean of SN ratios

    2.5

    2.0

    1.5

    1.0

    current

    groove angle

    Main Effects Plot for SN ratios

    Data Means

    curent

    groove angle

    120

    140

    160 45

    -15.6

    -15.8

    -16.0

    -16.2

    -16.4

    -16.6

    -16.8

    -17.0

    -17.2

    -17.4

    Mean of SN ratios

    60 75

    Signal-to-noise: Smaller is better

    75

    60

    45

    120 140 160

    Figure 4. Main Effects Plot for SN ratios.

    Signal-to-noise: Smaller is better

    0.95

    0.90

    MainEffects Plot for Means

    Data Means

    current

    groove angle

    Figure 3. Main effects Plot for SN ratios

    Main Effects Plot for Means

    Data Means

    Mean of Means

    0.85

    7.4

    7.2

    curent

    groove angle

    0.80

    0.75

    0.70

    120

    140

    160 45 60 75

    7.0

    Mean of Means

    6.8

    6.6

    6.4

    6.2

    120

    140

    160 45

    60 75

    Figure 5.Main effects plot for Means

    Figure 5.Main effects plot for Means

    TABLE III

    Current

    Groove angle

    Weld Bead Width

    SNRA1

    MEAN1

    120

    45

    6.85

    -16.7138

    6.85

    120

    60

    6.5

    -16.2583

    6.5

    120

    75

    5.2

    -14.3201

    5.2

    140

    45

    7.1

    -17.0252

    7.1

    140

    60

    6.66

    -16.4695

    6.66

    140

    75

    8.08

    -18.1482

    8.08

    160

    45

    7.36

    -17.3376

    7.36

    160

    60

    6.88

    -16.7518

    6.88

    160

    75

    7.01

    -16.9144

    7.01

  3. RESULTS AND DISCUSSION

    In this research it clearly brought the concept of of the effects of current and groove angle on weld pool geometry and also the graphs are plotted for weld bead height and weld bead width with reference to the number of experiments in order to find mean value for both the weld bead width and weld bead height . Although the effects of different groove angle and current values are being plotted in reference to the Signal-to-noise ratio and Mean values for SS304 .

  4. CONCLUSION

The appropriate TIG pulse welding parameters for SS304 Stainless Steel by varying the values of current and groove angle on the weld bead width and weld bead height were established. The current varies from 120-160 and the groove angle varies from45-75. This research is done in order to overcome the previous research that was made on SS304 other than this research

REFERENCES

      1. A Text book of Manufacturing Process, O.P Khanna , Dhanpat Rai Publications ch-7,ar-

        7.11 2009 Edition

      2. A Text book of Material Science, C.K Narula, K.S Narula, V.K gupta, Tata McGraw Hill 2009 Edition

      3. Tarng Y.S. and Yang W.H.(1998). Optimization of weld bead geometry in Gas Tungsten Arc Welding by the Taguchis method .International journal of advanced manufacturing technology, vol. 14, pp. 549-554

      4. http;//www.bocworldofwelding.com.au/media/pdf/ WELDING%20CONSUMABLES-

        Stainless%20Steel.pdF

      5. Welding and welding technology.Richard L Little, Tata McGraw Hill-Publishing Company limited.

        ISBN; 0-07-099409-9

      6. Welding Technology & Design . V.M.Radhakrishnan. New Age International publisher. ISBN; 81-224-1672-1.

      7. ASTM standard A-370 standard testing methods and definitions for mechanical testing of steel products.

      8. Laksminarayan A.K. Balasubramanian V. and Elangovan K.(2009) Effect of welding process on tensile properties of AA6061 aluminium alloy joints. International journal of Advanced Manufacturing Technology. Vol.40.286-296.

      9. Choi B.H. and Choi B.K.(2008). The effect of welding conditions according to mechanical properties of pure titanium. Journal of Materials Processing Technology.vol 201. pp.526-530.

      10. Juang Sc, TarngYS. Process parameter selection for optimizing the weld pool geometry in the tungsten inert gas welding of stainless steel . J Mater Technology2002;122(1) 33-37

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