Why hydrogen not used excessively for welding?

Related MCQs

• 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.
• Due to which of the following reasons, flux is not used in atomic hydrogen welding?
• In inertia friction welding energy of welding machine is used.
• In inertia friction welding              energy of welding machine is used.
• Which of the following welding process in which heat is produced for welding by a chemical reaction?
• What is the differentiating factor between flux core arc welding and gas-shielded metal arc welding processes?
• Weld strength in inertia friction welding is more than direct drive friction welding.
• Consider a situation in which a welding operation is being performed with V = 20 volts, I = 200 A, and the cross-sectional area of the weld bead is 30 mm2. Estimate the welding speed if the workpiece and electrode are made of (a) aluminum, (b) carbon steel, and (c) titanium. Use an efficiency of 75%.
• If the open circuit voltage is 60 volt and the short circuit current is 20 amperes. Then determine the voltage required for welding if the current required during welding is 10 amperes?
• What is the only difference between Plasma arc welding and TIG welding?