焊接的

This paper introduces systemical properties, applications status and choice principle of welding process used in long-distance transport pipeline.

系统地介绍了目前长输管道现场安装焊接常用的一些焊接方法的特点、应用情况及其选择原则，为选用经济合理、高效高质量的安装焊接方法提供了一定的技术支持。

The results indicate that the welding temperature is the most important factor for diffusion welding of composite. When the welding temperature range is between solidus and liquidus, the peak joint strength can reach 170 MPa.

指出焊接温度是复合材料扩散焊接最重要的工艺参数，焊接温度介于基体合金固相线与液相线之间，接头强度最高值可达到170 MPa；接合界面的氧化膜阻碍基体原子的扩散，是复合材料接头强度下降的原因之一。

LTHJ-SUPER-A2 welding manipulator automatic recovery machine(Condensed air is needed0.4-0.8Mpa) This system is set for welding manipulator,special cylindrical welding tools or difficult welding .It adds super negative pressure wind pump on inner side offlux cylinder,so that in the welding process it can absorb unmelted flux directly into cylinder and place into a small hopper.Open the valve of small hopper and put flux onto work piece,then you can put it into reprated usage.

LTHJ-SUPER-A2型操作机正压自动回收机（需压缩空气0.4-0.8Mpa）本系统是为一体超强新型的操作机或外圆焊接特制工具、高难度的焊接而设置的，它利用压缩空气，将在焊接过程中尚未溶化的焊剂直接吸收到桶内，放置到小料斗中，打开小料斗阀门把焊剂放到工件上，进行往复使用。

The effect of heat transfer characteristics on the weldability...

这种传热特性对贝氏体钢轨的焊接性有明显的影响；根据计算及试验结果，贝氏体钢轨的焊接应当采用比珠光体钢轨更小的焊接热输入参数。

LTHJ-SUPER-A1 Gantry welding automatic recovery machine This system is set for one body super new portal welder, special cylindrical welding tools or difficult welding. It adds super negative pressure wind pump on inner side of flux cylinder, so that in the welding process it can absorb unlyzed flux directly into cylinder and place into a small hopper. Open the valve of small hopper and put flux onto work piece, then you can put it into repeated usage.

LTHJ-SUPER-A1型龙门焊自动回收系统本系统是一体超强新型的门式焊机或外圆焊接特制工具、高难度的焊接而设置的，它就是一个焊剂筒内加上超强负压风泵，使在焊接过程中尚未溶化的焊剂直接吸收到筒内，放置到小料斗中，打开小料斗阀门把焊剂放到工件上，进行往复使用。

When the Al-Mg-Zr-Sc welding wire was used as filling material,the grains of welding seam were refined obviously,and the weld joint was greatly strengthened by forming of fine equiaxial grains layer in fusion zone .

但采用Al-Mg-Zr-Sc合金焊丝为填充材料时，焊缝晶粒组织明显细化，熔合区形成的细小等轴晶层提高了基材与焊缝填充材料的结合力，焊接接头的屈服强度比采用Al-Mg-Zr合金焊丝为填充材料时提高了100 MPa，显著提高了Al-Mg-Sc合金焊接构件的许用强度，因此焊接Al-Mg-Sc板材更宜采用Al-Mg-Sc-Zr焊丝。

Test results show 1 the fatigue strength of peened joints under overloading, in spite of lower than the fatigue strength of the non-overloading peened joints, is still greatly higher than the fatigue strength of as-welded joints; 2 In the range of lower stress level and longer life, ultrasonic peening method exhibit better results than TIG dressing; 3 Fatigue strength of the welded joints with defects (such as undercut at the weld toe) can also be improved greatly after peening treatment.

结果表明，超声冲击处理过的焊接接头经过载后疲劳性能有所下降，但与原始焊态相比提高疲劳强度、延长疲劳寿命的效果仍然十分显著；在低中应力水平、中长寿命区域，使用超声冲击法提高焊接接头疲劳强度比TIG熔修法效果更好；超声冲击处理后，含咬边等缺陷的焊接接头，疲劳强度同样有较大的提高。

Such as the 12mm plate butt welded flat bottom closure φ3.2mm the electrode selection, welding current :80-85A, filling, cover the surface layer of the electrode selection φ4.0mm, welding current :165-175A, a reasonable choice welding current and electrode diameter, easy to control bath temperature, is the basis for forming weld.

如12mm平板对接平焊的封底层选用φ3.2mm的焊条，焊接电流：80-85A，填充，盖面层选用φ4.0mm的焊条，焊接电流：165-175A，合理选择焊接电流与焊条直径，易于控制熔池温度，是焊缝成形的基础。

The influence of different post weld heat treatment conditions on the microstructures and mechanical properties of friction welded joints between drill pipe DZ60 steel and its tie-in 40Cr steel has been discussed.

摘 要：首次采用摩擦焊接工艺对地质勘探用钻杆的管体与接头进行了焊接试验，探讨了不同的热处理工艺条件对DZ60钢钻杆管体与40Cr钢接头摩擦焊接头组织与性能的影响，并与采用热墩粗工艺生产的钻杆管体组织与性能进行了对比。

The results show that, the coefficients of welded joints are both greater than 0.9, but the yield strength of weld joint filled with Al-Mg-Zr-Sc welding wire is greater 100 MPa than that of filled with Al-Mg-Zr welding wire. It indicates that the Al-Mg-Zr-Sc welding wire is the best alteration of filling materials to weld of Al-Mg-Sc alloy.

但采用Al-Mg-Zr-Sc合金焊丝为填充材料时，焊缝晶粒组织明显细化，熔合区形成的细小等轴晶层提高了基材与焊缝填充材料的结合力，焊接接头的屈服强度比采用Al-Mg-Zr合金焊丝为填充材料时提高了100 MPa，显著提高了Al-Mg-Sc合金焊接构件的许用强度，因此焊接Al-Mg-Sc板材更宜采用Al-Mg-Sc-Zr焊丝。

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％。