问题 问答题

常用减少焊接残余应力的工艺措施有哪些

答案

参考答案:(1)采用合理的焊接顺序和方向。
1)先焊收缩量较大的焊缝,使焊缝能较自由地收缩。
2)先焊错开的短焊缝,后焊直通长焊缝。
3)先焊工作时受力较大的焊缝,使内应力合理分布。
(2)降低局部刚性。
(3)锤击焊缝区法。
(4)预热法。
(5)加热减应区法。

阅读理解

THEME PARKS – FUN AND MORE THAN FUN

Disneyland will bring you into a magic world. As you walk around Disneyland, you may see Snow White and Mickey Mouse in a parade or on the street. If you want to have fun and more than fun, come to Disneyland!

Dollywood, in the beautiful Smoky Mountains in the southeastern USA. Although Dollywood has rides, the park’s main attraction(吸引力) is its culture. You can even take a ride on the only steam-engine train still working in the southeast USA. Come to Dollywood to have fun learning all about America’s historical southeast culture!

If you want to experience the ancient days, England’s Camelot Park is the place for you. Every area of the park is modeled after life in the days of King Arthur and the Knights of the Round Table. To enter a world of ancient England, come to Camelot Park!

Some theme parks are not only for fun but also educational. Take the Polynesian Cultural Center(PCC) in Hawaii as an example. It not only shows visitors the Polynesian way of life but also protects their skills and culture for the future.
小题1:Which park will bring you into a magic world?
A. Disneyland.                          B. Dollywood.
C. Camelot Park.                        D. The PCC.
小题2:What’s Dollywood’s main attraction?
A.Magic shows.B.King Arthur’s life.
C.Polynesian culture.D.America’s southeast culture.
小题3:What can you enjoy in Camelot Park?
A.Meeting Snow White.
B.Experiencing ancient England.
C.Riding on the steam-engine train.
D.Feeling the Polynesian way of life.
单项选择题