Keyhole stability during plasma arc welding welding process is critical to the process stability and weld quality.

在穿孔等离子弧焊接过程中，小孔稳定性对焊接过程的稳定和优质的焊缝成形是非常关键的。

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Welding welding operation must hold professional certificates, and strictly abide by the rules.

气焊电焊必须持专业操作证，并严格遵守操作规程。

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The paper introduces welding technology of type ZY6400/12.5/28 hydraulic support, from several respects of selecting materials preheat before welding, welding process and so on.

从焊接材料的选用，焊前预热、焊接过程和焊后热处理的控制几个方面，着重介绍了ZY6400/12.5/28型液压支架的焊接工艺。

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But Ares will use new methods in metal-working science such as friction stir welding.

VOA: special.2009.12.30

Scientists developed the new welding technology at the Marshall Space Flight Center in Montgomery,Alabama.

VOA: special.2009.12.30

And,friction stir welding uses fewer workers at less cost than other methods.

VOA: special.2009.12.30

In 1999, when Hoechst merged with Rhone-Poulenc to form Aventis, it decided to sell Messer Griesheim's welding business.

ECONOMIST: Face value

Outside, everyone looks busy, from elderly ladies selling socks to young men welding pipes and repairing used electronics.

BBC: Reliving Shanghai��s 1930s past

One of the hottest topics on the tort lawyer conference circuit is welding rod litigation.

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