焊的

This paper analyzes the cause of small concaves around the welding seam in the long rail of Guangzhou Metro Line 2, and presents preventive measures, such as increasing the under layer of the rail, limiting the weld seam, lowering the welding temperature etc.

摘要结合广州地铁2号线接触焊焊接长钢轨的实践，分析了产生焊头表面小凹痕的原因，提出改变垫高钢轨的方式、缩小正火範围、降低正火温度、限制接头错牙量等预防措施。

In the process of Lead-free, because of the difference of lead-free solders and adjustment of technical parameter, we will face many new problems of reliability.

在无铅化进程中，由于无铅焊点焊料的不同和焊接工艺参数的调整，必然会给焊点可靠性带来许多新的影响。

MATLAB is a powerful tool for improving performances of arc welding inverter, and it is a new method for quantitative analysis in the dynamic process of nonlinear arc welding system.

从而为研制工艺适应性优良的新型弧焊逆变电源和定量分析非线性弧焊系统的动态过程提供了一个强有力的工具。

In this article,through introducing the automatic argon arc weld ing equipment and the method of selecting the parameters,it was proved that the technique of automatic argon arc weld is one of the best methods to enhance the weld quality and efficiency.

通过对全自动氩弧焊设备及工艺参数的选择方法的介绍，说明全自动氩弧焊技术是提高焊接质量和效率的最佳方法之

In addition, more than 20 kW of high-power lasers for welding of more than 10 mm thick steel plate, as a result of higher heat input, low cooling rate, the degree of hardening of the weld with manual arc welding and gas close to Paul.

另外，使用超过 20 kW的大功率激光器来焊接10 mm 以上的厚钢板，由于输入热量更高，冷却速度变低，焊缝的硬化程度将与手工电弧焊和气保焊水平接近。

In recent years, armed with strong technical resource, we always develop new products on the basis of original products, including such new products as inverse argon arc welder, carbon dioxide welder etc.

近 年来，凭借雄厚的技术力量，严格的科学管理，在稳固原有产品的基础上，积极开发新产品，如逆变氩弧焊机，二氧化碳焊机等多种新产品。

In recent years,armed with stuong technical resource,we always develop new products on the basis of original products,including such new products al inverse argon arc welder,carbon dioxide welder etc.

近年来，凭借雄厚的技术力量，严格的科学管理，在稳固原有产品的基础上，积极开发新产品，如逆变氩弧焊机，二氧化碳焊机等新产品。

Using the full set of mature advanced production equipment and testing instruments, is now owned by more than imports of machines, 50 semi-automatic wire bonders, and this year the introduction of two ASM AB-309 type automatic wire bonders and the AD-809 auto-crystal Machinery and equipment, greatly expanding the company's manufacturing strength.

公司采用先进成熟的全套生产设备及检验仪器，现已拥有多台进口分光机，50台半自动焊线机，并于今年引进两台ASM AB-309型号自动焊线和AD-809自动固晶机械设备，极大的壮大了公司的生产实力。

The test results show that the crispest HAZ occurs in the process of welding of the 14MnNbq steel on the first heat circulation submerged welding overheat zone and the second heat circulation submerged welding overheat zone plus the not entirely re crystallized zone. The 14MnNbq steel has a tendency of being crisper due to overheat than the SM490C steel is. In order to ensure the toughness of the welding HAZ′s, the welding wire capacity should be properly controlled during welding.

由试验结果表明，14MnNbq钢焊接HAZ最脆区出现在一次热循环的埋弧焊过热区及二次热循环的埋弧焊过热区+不完全重结晶区；14MnNbq钢比SM490C钢有更强的过热脆化倾向，为确保焊接热影响区韧性，焊接时应适当控制焊接线能量。

On the base of the characteristics of the plate frame, a new process that produces plate as section by section is designed in this thesis and any type of plates can be manufactured by one suit of dies through this process.

全焊式板式换热器克服了普通板式换热器的缺点，在国外得到了广泛应用。本文根据引进的国外产品，设计制造了一条用来生产全焊式板式换热器板片的自动化冲压生产线。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。