Английский язык для инженеров сварочного производства. Гричин С.В - 76 стр.

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Fig. 15 The fixture

FSW of Steel

Steel can be friction stir welded but the essential problem is that tool

materials wear rapidly. Indeed, the wear debris from the tool can frequently

be found inside the weld. The process would therefore be used in special

circumstances where other welding methods are inadequate. These

circumstances have yet to be clarified. There are so many good methods by

which steel can be welded. The example below is the FSW of 316L stainless

steel. Notice that the sample becomes red-hot during welding.

Fig 16 Obtaining a weld

Since the tool gets red hot, it is necessary to protect it against the

environment using a shielding gas. A possible use of FSW in the welding of

steels is in the context of stainless steels. Austenitic stainless steels can easily

be welded using conventional arc welding and other processes. However,

FSW can offer lower distortion, lower shrinkage and porosity. More

important is the avoidance of fumes containing hexavalent chromium which

is carcinogenic. In addition, chemical segregation effects associated with

welding processes involving solidification are avoided. Such segregation can