Welding
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Unstabilized stainless 302 and 304 are subject to carbide precipitation at the grain boundaries during welding. Explain this.
Carbide precipitation reduces corrosion resistance of welded joints.
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Consumable Mixup of SA335P12 butt joint welding
While doing welding of SA335P12 pipe with SA335P12 pipe, consumable we suppose to use to be E8018-B2 but due to welder negligence E9018-B3 is used wrongly. What kind of problems ...
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Industrial practice: Mig/Mag welding
During Mig/Mag welding the molten end of the filler wire must be cut at each interruption of the electric arc. Explain why.
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Lamellar tearing: carbon steels thin sheets
Does the lamellar tearing defect occur in welded thin sheets of carbon steels? Explain why.
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Industrial practice: Mag welding
Mag welding of carbon steels thin sheets is performed in reverse polarity (+). Mention at least 2 technical reasons. Why not straight polarity (-)?
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Welding positions: thick plates and tubes
Are the welding positions applied to the thick steel plates the same as for the steel tubes? Why?
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What Is The is 3G &6G Welding? How to inspect it?
What Is The is 3G &6G Welding? How to inspect it? Where itis mostly used this types of welding describe here?
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Electrodes used in spot welding are made up of which material?
a) Only Copper b) Copper and tungsten c) Copper and chromium d) Copper and aluminium
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Lamellar tearing: aluminum alloys
Does the lamellar tearing occur in welded joints of aluminum alloys, plates and tubes? Explain why.
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Industrial practice: coated electrode
The eccentric core of the coated electrode produces these defects in welding and weld bead:unstable electric arc, splatters, slag inclusions, undercuttings, porosities and cracks. ...
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Copper alloys: oxyacetylene brazing
In oxyacetylene brazing of copper alloys, is the neutral flame the right one? Why not the oxidizing flame?Explain.
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Alloy steels: oxyacetylene preheating
In the oxyacetylene preheating of alloy steels for welding with shielded electrode, why always avoid the carburetant flame? Explain.
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During welding (MMA), if the arc action is rough and erratic, the electrodes may be dry. Is it correct?
Consider hygroscopic water.
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Hydrogen porosity is often observed in aluminum welds. Why not cracking?
Consider solubility of hydrogen in aluminum (liquid and solid).
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Is it necessary preheating of austenitic stainless steels before welding? Why?
Is not necessary to preheat austenitic SS, but postweld stress relieving is recommended.
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