Welding Processes: Metal Inert Gas and Submerged Arc Welding

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Which type of welding process uses a non-consumable electrode made of tungsten?

MIG

FCAW

SAW

TIG (correct)

What is the purpose of the flux coating in Shielded Metal Arc Welding?

To produce a shielding gas (correct)

To form a slag

To carry welding current

To provide additional filler

What is the common name for Shielded Metal Arc Welding?

Flux welding

MIG welding

Stick welding (correct)

TIG welding

What is the hazardous effect of arc rays in arc welding?

Injury to eyes and skin Signup and view all the answers

What is the purpose of the slag in Shielded Metal Arc Welding?

To protect the weld from atmospheric gases Signup and view all the answers

What is the safety precaution to avoid electric shock in arc welding?

Do not touch the electrode or metal parts with skin or wet clothing Signup and view all the answers

What is the purpose of back stepping into the last weld's crater when restarting a weld bead?

To ensure a seamless transition from one weld to the next Signup and view all the answers

Which of the following is NOT a mode of metal transfer in GMAW?

Welding Speed Signup and view all the answers

What is the minimum tensile strength of an ER70S-X electrode rod?

70,000 psi Signup and view all the answers

What is the primary difference between torch brazing and furnace brazing?

The location of the heat source Signup and view all the answers

Which brazing method uses a molten salt or metal bath?

Dip brazing Signup and view all the answers

What is the consequence of large craters in GMAW?

Weld cracking Signup and view all the answers

What is an advantage of GMAW over SMAW?

Easier to learn Signup and view all the answers

What is the melting temperature of the filler metal in soldering?

Less than or equal to 450 oC Signup and view all the answers

What is a limitation of GMAW equipment?

Is more susceptible to wind interference Signup and view all the answers

What is the primary advantage of soldering over brazing and fusion welding?

Lower energy requirements Signup and view all the answers

What is the primary disadvantage of soldering?

Low joint strength unless reinforced Signup and view all the answers

What is the common alloy used in solder filler?

Alloys of tin (Sn) and lead (Pb) Signup and view all the answers

What is the primary advantage of brazing over fusion welding processes?

Reduced heat and power required Signup and view all the answers

What is the primary limitation of brazing?

Limited joint strength Signup and view all the answers

What is the role of capillary action in brazing?

To draw molten filler metal into the joint Signup and view all the answers

What type of joint is more widely used in brazing due to its larger interface area?

Lap joint Signup and view all the answers

What is the primary application of brazing in the automotive industry?

Joining tubes and pipes Signup and view all the answers

What is the term for the area of the base metal that is affected by the heat of the brazing process?

Heat affected zone Signup and view all the answers

What is a characteristic of tin in soldering?

It promotes wetting action for successful joining Signup and view all the answers

What is a disadvantage of using lead in soldering?

It is poisonous Signup and view all the answers

What is the purpose of crimping a lead wire on a PC board?

To secure the joint by mechanical means Signup and view all the answers

What is the difference between hand soldering and wave soldering?

Wave soldering is used for multiple lead wires in printed circuit cards Signup and view all the answers

What is the purpose of reflow soldering?

To solder surface mount components on printed circuit cards Signup and view all the answers

What is formed when soldering copper?

Intermetallic compounds Signup and view all the answers