Answer: A. Steel Oxidising flame is used to weld metals like———— A. Answer: B. Copper and brass The following flux is used for brazing brass, copper, bronze and low carbon steels———— A. Mixture of boric acid, borux and a wetting agent B. Boric acid, borax or fluoride with a wetting agent C. Chlorides and fluorides mixed with water D. All of the above Answer: A. Mixture of boric acid, borux and a wetting agent The following flux is used for brazing cast iron———— A.
All of the above Answer: B. Boric acid, borax or fluoride with a wetting agent Oxygen to acetyline ratio in case of oxidising flame is———— A. Acetylene gas is generated form of…… A. Carbon B. Calcium C. Calcium carbonate D. Calcium carbide Answer: D. Calcium carbide Acetelyne is stored in gas cylinder in———— A. In gaseous form B. In liquid form C. In solid form D. Under high pressure Answer: B. In liquid form Submerged arc welding is———— A.
A process which uses a mixture of iron oxide and granular aluminium B. Accomplished by maintaining a hot molten metal pool between plates C.
A process in which arc is maintained under a blanket of flux D. All of the above Answer: C. A process in which arc is maintained under a blanket of flux The electroslag welding is———— A. There is nothing called electroslag Answer: B. Accomplished by maintaining a hot molten metal pool between plates Arc-welding uses following electric supply ————..
Spiral waveform Answer: C. Both A. The most commonly used flame in gas welding is…… A. Neutral B. Oxidising C.
Carburising D. Neutral Thermit welding———— A. A process in which arc is maintained under blanket of flux D. In no welding process Answer: E. A process which uses a mixture of iron oxide and granular aluminium Carbon arc welding is———— A. Used to weld carbon rods D. None of the above Answer: D. None of the above In inter gas arc welding following is used for welding magnesium———— A. No-combustible electrode in combination with helium and D.
Combustible electrodes and argon in combination with A. Straight polarity D. Carbon dioxide, because of its excellent penetration and high speed Answer: A. In inter gas arc welding following is used for welding alluminium———— A.
Carbon dioxide, because of its excellent penetration and high speed Answer: B. Distortion in welding occures due to…… A. Use of excessive current B. Improper clamping methods C. Use of wrong electrodes D. Oxidation of weld pool E. Improper composition of parent material Answer: B. Improper clamping methods In MIG welding, the metal is transferred in the form of———— A.
A fine spray of metal B. Molten drops C. Weld pool D. Molecules E. Very fine metal Answer: A. A fine spray of metal In reverse polarity welding———— A. Electrode holder is connected to the negative and work to positive B. Electrode holder is connected to the positive and work to negative C. Work is positive and holder is earthed D. Holder is positive and work is earthed E.
Work is negative and holder is earthed Answer: B. Electrode holder is connected to the positive and work to negative Equipment is used for arc welding a material by carbon electrode———— A. Rectifier C. Motor generator D. Cause: When the current setting is too high When welding speed is too fast By overheating of the job due to continuous heating Due to faulty electrode motion When electrode angle is wrong 2.
Cause: Too narrow edge penetration Excessive welding speed When the current setting is low When a larger diameter electrode is used Due to inadequate cleaning or gouging before depositing sealing run 3. Cause: Presence of contaminants on the job or electrode surface Presence of high sulphur in the job or electrode material Moisture trapped between joining surfaces Freezing of weld at a faster rate 4.
Cause: A too high current setting Use of moisture affected electrode Wrong polarity Use of a long arc Arc-blows 5. Cause: Improper welding technique High welding current By using large electrodes 6. Get Started for Free Download App. Answer Detailed Solution Below Option 4 : 3 : 1. Explanation : Thermit Welding: It is a welding process utilizing heat generated by an exothermic chemical reaction between the components of the thermit a mixture of metal oxide and aluminium powder.
Answer Detailed Solution Below Option 2 : electrode rod thickness. Explanation: Three units are used to describe any arc welding process. Voltage: Voltage is the measurement of electrical pressure. Voltage control the maximum gap the electron can jump to form an arc. Welding voltage is associated with welding temperature. Amperage: It is the measurement of the total number of electrons flowing. Amperage control the size of the arc.
The higher the amperage setting, the higher the heat produced by the welding arc, and the lower the amperage setting the lower the heat produced. Each diameter of the electrode has a recommended minimum and maximum amperage range and therefore a recommended heat range.
Amperage is associated with the welding heat. Wattage: It is the measurement of the amount of electrical energy or power in the arc i. Field weld Weld all around Flush contour Chipping finish. Short arc welding Long arc welding Spray arc welding Pulsed arc welding. Explanation: Welding technology The stability of a DC arc with a consumable electrode depends largely on how the molten metal is transferred in the arc.
One can be distinguished essentially between two different types of arcs, depending on material transport. Spray arc Short arc Short arc welding The heat input from Short arc welding is low, which makes the process suitable for welding in thinner materials.
The drops from the electrode dip into the weld pool. This can be repeated up to times per sec. If the short circuit current is too high, it has a considerable effect on the pinch-off forces, causing weld spatter. Some means of limiting the short-circuit current must therefore be provided in the power unit, e.
It is not easy, with Short arc welding, to achieve a completely stable arc. The objective is to achieve a consistent, high short-circuiting frequency, resulting in small droplets being transferred to the workpiece and spatter droplets being so fine that they do not adhere to the workpiece. Answer Detailed Solution Below Option 2 : submerged arc welding.
Explanation: Submerged a rc welding: In submerged arc welding the arc is completely submerged into the granular flux powder and forming a blanket. Thermit Welding: Thermit is a mixture of aluminium powder and metal oxide. Aluminium combines with oxygen and intense heat will be released. It is used for repair of railway track. Mild steel High carbon steel Grey cast iron Alloy steels. Explanation: The oxidizing flame is mainly used for welding brass.
Metal Flame Mild Steel Neutral High carbon steel Reducing Grey cast iron Neutral slightly oxidizing Alloy steel Neutral A carburizing flame is one in which the supply of acetylene is in excess as compared to the oxygen.
Neutral flame It is used to weld most of the common metals, i. What two items on a MIG welder would need to be changed when changing from 0. When performing a fillet weld between two pieces of 5mm thick mild steel, what is the recommended size leg length of the weld?
Related Topics. More Welding Quizzes. So, answer these Questions: 14 Attempts: Last updated: Oct 25, Sample Question. A gas that cools the weld zone to prevent cracking. A gas that prevents porosity by burning a hot neutral flame.
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