Pressure joining

Japanese: 圧接 - あっせつ（英語表記）pressure joining

A technique for joining metal materials by applying pressure to them in a solid state. In the atmosphere, metal materials are covered with oxide films and cannot be joined by pressure bonding as they are, but they can be joined by removing the surface coating and then pressure bonding. Therefore, pressure welding is possible even in cold conditions. Cold surface film removal takes advantage of the fragility of the oxide film, and causes a certain degree of plastic deformation in the joining metal, which breaks and falls off the film, allowing the material to be pressed. This method is used to join non-ferrous metals. There is also friction welding, in which the materials to be joined are rubbed against each other at high speed, and the joining is achieved by generating heat and removing the film. Hot joining is a method of heating and pressure bonding the joint with a gas flame. The key point is that the high temperature of the joint makes it easier for plastic flow and promotes contact between the metals. A steel pipe made by hot rolling a steel strip into a cylindrical shape and butting the joint at a temperature of about 200°K higher than the surrounding area is called a forge-welded steel pipe.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

金属材料を固体の状態で加圧して接合する技術。金属材料は大気中では酸化皮膜などにおおわれており，そのまま圧着しても接合できないが，表面被覆を除去し圧着すれば接合する。したがって，冷間でも圧接は可能である。冷間における表面皮膜除去は，酸化皮膜がもろいことを利用し，接合金属にある程度の塑性変形を生じさせ，皮膜の破壊脱落をはかることによって圧着する。この手法は非鉄金属の接合に適用されている。また，接合材相互を高速で摩擦させ，発熱と皮膜除去によって接合を果す摩擦接合もある。熱間接合は接合部をガス炎で加熱圧着する方法である。接合部を高温にすることによって塑性流動しやすくし，金属同士の接触を促すところにポイントがある。熱間で帯鋼をロール成形で筒状にし，接合部を 200°Kほど周囲より高温にし突き合せて製造した鋼管を鍛接鋼管という。

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