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Which of the following statement(s) is/are true regarding butt welding? 1. Flash butt welding is a combination of resistance, arc and pressure welding 2. Upset butt welding is used for welding rods 3. Percussion Welding is a self timing spot welding method 4. Aluminium alloys are flash welded
In a metal arc welding process, metal transfer across the arc may take place by a method of material transfer where the metal transfers across the arc is in larger drops. This is at the rate of 100 drops/sec or less, what is this known as
In DC arc welding, if leads are arranged in work as Negative pole of the welding arc and electrode as Positive pole of the welding arc, the arrangement is known as
If a gas metal arc process uses a low arc voltage and the arc is continuously interrupted as the molten electrode metal fills up the arc gap is known as
In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.
If the total efficiency is 0.35 in arc welding. Then what is the welding speed in mm/sec if the cross-sectional area is 5mm2, welding power is 2 kW and the heat required in melting the metal is 100 J/mm3.
In the consumable electrode shielded metal arc welding process, which of the following observations are correct?
P. The, weld composition does not depend upon the basicity of the slag.
Q. Basic flux is used to achieve low hydrogen content-and low inclusion content in the weld metal.
R. Reverse polarity of the direct current power source is used to weld thin sheets.
S. Coated electrodes are classified by tensile strength of the weld metal deposit.
A gas tungsten arc-welding operation is performed at a current of 500 A and voltage of 20 V. The melting factor f2 = 0.5, and the unit melting energy for the metal Um = 10 Jmm-3. Calculate the volume of metal welded? (Heat transfer factor is 0.7)
What is the differentiating factor between flux core arc welding and gas-shielded metal arc welding processes?
What is the effective throat thickness dimension of 10mm fillet weld made by shielded metal arc welding and submerged arc welding?