Welding

Question 0

Safety hazard when welding magnesium?

Answer 0

If ignited, hard to extinguish.

Question 1

What is the preferred method for welding magnesium?

Answer 1

Gas shielded arc welding (SMAW).

Question 2

Why is it necessary to use flux in all silver soldering operations?

Answer 2

Chemically cleans the base metal of oxide film.

Question 3

What is the function of the flux used in soldering?

Answer 3

Flux covers the cleaned and heated metal to keep oxygen away from it so oxides cannot form. Oxides keep the solder from adhering to the surface of the metal.

Question 4

The oxyacetylene flame for silver soldering should be;

Answer 4

A neutral oxyacetylene flame is normally used for silver soldering.

Question 5

What type of repair can be used when a steel structural tube is dented at a cluster?

Answer 5

A patch may be welded over the damaged area with fingers extending up each member of the cluster.

Question 6

How to insert tight sleeve into tube?

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Answer 6

Dry ice.

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Question 7

What are three types of welding?

Answer 7

Gas, arc, and resistance welding.

Question 8

How do you get a soft flame and not lose heat?

Answer 8

A larger tip size and adjust pressure.

Question 9

What is a common method for welding aluminum?

Answer 9

Gas shielded arc welding.

Question 10

Which valve should be turned off first when welding with an oxyacetylene rig?

Answer 10

Acetylene.

Question 11

What is meant by tack welding?

Answer 11

Tack welding is the use of small welded spots to hold the material together until the final bead is run.

Question 12

One method of controlling expansion when welding?

Answer 12

Tack weld along joint.

Question 13

Precautions followed when weld is completed?

Answer 13

Turn off valves, relieve all pressure.

Question 14

Aluminum alloy heat treated parts after welding must;

Answer 14

be reheat-treated.

Question 15

Insufficient penetration in welding causes what?

Answer 15

Weak welds.

Question 16

What type of welding causes less buckling and warping than gas?

Answer 16

Metallic arc welding.

Question 17

Define gas shielded arc welding.

Answer 17

(SMAW) Shielded metal arc welding, informally AKA stick welding, is a manual arc welding process that uses a consumable electrode coated in flux to lay the weld. An electric current, in the form of either alternating current or direct current from a welding power supply, is used to form an electric arc between the electrode and the metals to be joined. As the weld is laid, the flux coating of the electrode disintegrates, giving off vapors that serve as a shielding gas and providing a layer of slag, both of which protect the weld area from atmospheric contamination.

Question 18

Advantages of gas shielded arc welding?

Answer 18

Stronger, more ductile, and corrosion resistant.

Question 19

When welding, size of torch tip determines;

Answer 19

Amount of heat delivered, not temperature.

Question 20

Oxyacetylene rigs;
flame for Aluminum?
flame for Stainless Steel?

Answer 20

Alum = Soft and neutral
Stainless = Slightly carburizing