全文总字数：20043字

1. 研究目的与意义（文献综述）

1. purpose and significance (including analysis of research status at home and abroad)

the increasingly stringent regulations on vehicle emissions and the reduction of fuel consumption through vehicle weight loss have become social requirements. to meet these requirements, automobile manufacturers must manufacture exhaust system components using materials with better corrosion and heat resistance. as a result, the materials for the components of the automobile exhaust system have begun to shift from traditional castings and aluminized steel plates to stainless steel^[1]。

the united states began using ferrochrome titanium stainless steel for exhaust systems in the 1960s. japan set standards for exhaust emissions in the 1970s, allowing automakers to add ternary catalytic devices to their exhaust systems to purify exhaust emissions. in the late 1980s, the japanese government also stipulated the service life of the automobile exhaust system, thus speeding up the promotion and application of ferrite stainless steel. currently ,100% of cars in europe, the united states and japan use stainless steel for their exhaust systems.

2. 研究的基本内容与方案

2. basic content, objectives, technical solutions and measures to be adopted in the study (design)

2.1 basic content of the study

(1) material and performance analysis of rear exhaust tailpipe for sedan stainless steel.

3. 研究计划与安排

3.scheduling

1-2(week 18-19 of the 7th semester) determine graduation project topics, improve graduation project taskbook (related parameters), data collection inside and outside the school

3-4(week 1-2 of 8th semester)project conception, literature search, completion of opening report

4. 参考文献（12篇以上）

4.references read

[1].yoshiharu inoue. masao kikuchi.present and future trends of stainless steel for automotive exhaust system.nippon steel technical report .2003,88:p.62-68.

[2].李少华，康蓉娣.激光焊接技术及其应用[j],舰船防化,2011(4):32-36.