Jeppesen Oral- Chapter 4 ( Welding ) Flashcards
Name the three principle types of welding
Gas, arc, electrical resistance
What are some of the advantages of gas shielded arc welding?
The weld is stronger, more ductile and corrosion resistant
Which method of welding is less likely to cause buckling or warping of thin metal sheets?
Electrical arc or TIG welding
What is the purpose of shielding an arc weld with an inert gas?
The gas prevents atmospheric oxygen and or nitrogen from contaminating the weld
What is a common method of controlling expansion when welding a joint?
Place tack welds along length of joint
What is the effect if inadequate penetration on a weld?
The weld will be weak
What is the purpose of the flux used with brazing and silver soldering?
The flux cleans the base metal by removing any oxide film
What type of flame is used when torch brazing or solver soldering?
Neutral flame
What must be done to a soldering iron tip to increase the amount of heat transferred from the tip to the work?
The tip must be clean of all contaminates and properly tinned
What is the preferred method for welding aluminium?
Tungsten Inert Gas welding
What is the preferred method for welding magnesium?
Tungsten Inert Gas welding
What precautions must be observed in order to weld titanium?
All traces of oxygen and nitrogen must be kept away from the weld area
Describe one type of repair that could be made to a dented steel tube cluster joint.
A formed steel patch plate could be welded over the damaged area
How can a soft flame be obtained without reducing the heat output of the torch?
Use a larger tip and adjust the gas pressure accordingly
What factors determine the amount of heat delivered by a gas welding torch?
Use a larger tip and adjust the gas pressure
What factors determine the amount of heat delivered by a gas welding torch?
The size of the torch and the gas pressure
When an oxyacetylene torch us extinguished, which valve is turned off first?
Acetylene gas valve
When a gas welding project is completed, what safety precautions should be accomplished?
All the valves are turned off and gas pressures are relieved
What should be done to a heat-treated aluminium part after welded repairs are completed?
The part must be re-heat treated
Welding magnesium can create a serious safety hazard. What is the nature of this hazard?
Burns very hot and very hard to extinguish
What technique might be used to enable a tight-fitting inner sleeve to be inserted into a tubular repair?
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.
