Jeppesen Oral- Chapter 4 ( Welding )

Question 1

Name the three principle types of welding

Answer 1

Gas, arc, electrical resistance

Question 2

What are some of the advantages of gas shielded arc welding?

Answer 2

The weld is stronger, more ductile and corrosion resistant

Question 3

Which method of welding is less likely to cause buckling or warping of thin metal sheets?

Answer 3

Electrical arc or TIG welding

Question 4

What is the purpose of shielding an arc weld with an inert gas?

Answer 4

The gas prevents atmospheric oxygen and or nitrogen from contaminating the weld

Question 5

What is a common method of controlling expansion when welding a joint?

Answer 5

Place tack welds along length of joint

Question 6

What is the effect if inadequate penetration on a weld?

Answer 6

The weld will be weak

Question 7

What is the purpose of the flux used with brazing and silver soldering?

Answer 7

The flux cleans the base metal by removing any oxide film

Question 8

What type of flame is used when torch brazing or solver soldering?

Answer 8

Neutral flame

Question 9

What must be done to a soldering iron tip to increase the amount of heat transferred from the tip to the work?

Answer 9

The tip must be clean of all contaminates and properly tinned

Question 10

What is the preferred method for welding aluminium?

Answer 10

Tungsten Inert Gas welding

Question 11

What is the preferred method for welding magnesium?

Answer 11

Tungsten Inert Gas welding

Question 12

What precautions must be observed in order to weld titanium?

Answer 12

All traces of oxygen and nitrogen must be kept away from the weld area

Question 13

Describe one type of repair that could be made to a dented steel tube cluster joint.

Answer 13

A formed steel patch plate could be welded over the damaged area

Question 14

How can a soft flame be obtained without reducing the heat output of the torch?

Answer 14

Use a larger tip and adjust the gas pressure accordingly

Question 15

What factors determine the amount of heat delivered by a gas welding torch?

Answer 15

Use a larger tip and adjust the gas pressure

Question 16

What factors determine the amount of heat delivered by a gas welding torch?

Answer 16

The size of the torch and the gas pressure

Question 17

When an oxyacetylene torch us extinguished, which valve is turned off first?

Answer 17

Acetylene gas valve

Question 18

When a gas welding project is completed, what safety precautions should be accomplished?

Answer 18

All the valves are turned off and gas pressures are relieved

Question 19

What should be done to a heat-treated aluminium part after welded repairs are completed?

Answer 19

The part must be re-heat treated

Question 20

Welding magnesium can create a serious safety hazard. What is the nature of this hazard?

Answer 20

Burns very hot and very hard to extinguish

Question 21

What technique might be used to enable a tight-fitting inner sleeve to be inserted into a tubular repair?

Answer 21

The inner tube could be chilled with a dry ice or in a freezer while the outer tube could be heated slightly with a torch.