结果表明，随激光功率增大和焊接速度降低，复合焊与单一激光焊焊缝的横截面形貌均由钉形向近X形转变。
It showed that the weld cross section with both laser welding processes transformed from nail shape to near X shape with increase of laser power and decrease of welding speed.
下向焊这种焊接新工艺在国内已广泛用于长输管道的焊接。
A new welding technique on down-welding has been widely used in welding of long distance pipeline.
重点论述了前向兼容与后向兼容、锡须、空洞与微空洞、可焊性涂层以及如何避免无铅转移中出现的问题。
The forward compatibility backward compatibility tin whisker voids micro-voids and surface finishes were emphasized and how to avoid the lead free transfer problems were reviewed.
为保证接头的焊接质量，推荐了纤维素型下向焊条管子全位置焊的焊接规范并详细介绍了操作要领。
To ensure the welding quality of pipe joints this article recommends the welding specifications on pipe's all position with the fiber down-welding electrode and introduces in detail the operation way.
本文是第一次向国内公开介绍这种全新的预处理工艺，供国内焊管行业参考。
The new pre-treating Process is first described publicly in the article in order to provide references for the pipe-welding industry of our country.
介绍了药芯焊丝自保护下向焊技术。
Introduced here is the advanced flux cored down weld technology.
通过对下向焊焊接工艺和焊口的受力分析，解析出其产生裂纹的原因，提出了相应的防止对策。
The relative Solutions to cracks are given by studying the downhill welding process and cracking stress analysis.
向AF305活性剂中添加铝粉改变焊渣分布，研究焊渣分布与熔深的关系，证实了焊渣成片分布能增加焊接熔深。
Relation between slag contribution and weld penetration is studied by adding aluminum powder into AF305 to change this distribution.
以振动送丝方式向熔滴施加附加机械力(能量)来实现恒定直流mag焊稳定射滴过渡是解决钢焊丝mag焊接工艺现存问题的有效途径。
It is an effective method to solve the existent problems in MAG welding of steel by injecting mechanical force to the metal droplet.
分析了手工下向焊、半自动焊、自动焊及特种焊等焊接方法的特点，在选择焊接方法时应考虑管道直径、壁厚、管道长度、设计条件、管子级别等因素。
The features of manual downhill welding, semiautomatic welding, automatic welding and other welding technologies like butt flash welding and laser beam welding (LEW) and so on are analyzed.
本衬垫由陶瓷衬块和铁皮槽组成，供立向气电自动单面焊。
This backing consists of the ceramic backing block and the metal case. It is suitable for SEGARC automatic process.
从中间向两端逐步退焊法变形最小，采用逐段跳焊法也可以减少变形。
Take welding from middle to both ends step by step may have the least deformation, or take welding from one section to another step by step may also reduce the deformation.
而三种工艺参数的焊后变形最大值均位于大接管左侧的焊缝处，沿左侧焊缝向容器底部方向变形逐渐减小，在接近容器底部变形又开始增大。
The MAX deformation lie to left side of big pipe, and the deformation get smaller removed from left side to container bottom, as close to the bottom, the deformation began to harder.
此外，副通道以所需的一定间隔横向或斜向焊封或胶粘而分隔成纵向节段；
Two vertical edges of the utility model are overlapped and welded up or glued to form a main channel and an assistant channel.
结果表明：储能焊能够实现TC4钛合金薄板的快速凝固焊接，焊接接头由熔核和熔核向母材过渡的熔合区（线）组成。
The results show that the welding of TC4 can be realized by capacitor discharge welding. The joint microstructure consists of nugget zone and semi-melt zone.
结果表明：储能焊能够实现TC4钛合金薄板的快速凝固焊接，焊接接头由熔核和熔核向母材过渡的熔合区（线）组成。
The results show that the welding of TC4 can be realized by capacitor discharge welding. The joint microstructure consists of nugget zone and semi-melt zone.
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