Английский для сварщиков. Гричин С.В. - 48 стр.

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48
2. Furnace heating is usually employed in
a) friction joining b) diffusion bonding c) ultrasonic joining
3. The consumable electrode is made
a) negative b) positive c) neither
4. Total energy input in all welding processes is
a) is greater than required to produce a joint b) is smaller than required
to produce a joint c) equals to required to produce a joint
5. Reactions of most metals with the atmosphere or other nearby metals can
1) improve the properties of a welded joint b) make the properties of a
welded joint worse c) never influence the properties of a welded joint
6. The most common gas used in gas-shielded metal-arc and gas-shielded
tungsten-arc welding is
a) argon b) oxygen c) carbon dioxide
7. If not controlled, residual stress results in
a) precipitation processes in welded structures, b) freezing of the weld-
metal c) bowing or distortion of the weldment.
True or false?
1. There is always a welding pool in solid-phase welding processes.
2. Total energy input in all welding processes is greater than needed to
produce a weld.
3. Reactions of metals with the atmosphere or other nearby metals are
favorable to the properties of a welded joint.
4. Fluxes and inert atmospheres play a protective role and prevent oxidation.
5. The heat-affected zone is a region with unaltered properties.
6. Residual stress is present in all welded structures.
Answer the following questions:
1. What is a weld?
2. How can the heat be supplied for welding?
3. Is pressure employed in solid-phase processes?
4. What does an arc column consist of?
5. How is heat applied during welding?
6. What is the role of inert atmospheres?
7. What can make a joint brittle while welding?
8. What does the weld metal comprise in arc welding?
9. What is the base metal influenced by?
10. How can residual stress in welded structures be controlled?

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