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Subject: needle hammer Кто-нибудь знает, что такое needle hammer и с чем его едят?контекст такой:
As preparation for peening the surface shall be dressed in a way that makes lack of coverage
detectable, preferably by stone grinding. Applicable tool for grinding is normally a rotary burr or
stone of 6 to 8 mm diameter when a single tool hammer is used and 10 to 12 mm when a needle
hammer is used. The depth of the groove is approximately 0.5 mm below the original surface.
All surface defects shall be removed by grinding prior to peening.
Applicable tool for peening is normally pneumatic hammers. A needle hammer is normally used
when a wider area shall be covered. For local toe peening a single tool hammer is recommended.
Correct tool is essential to maintain correct peening in compliance with requirements.
Special tools with adjusted curvature shall be prepared in accordance with weld geometry.
Needle peening shall be applied with a coverage of minimum 200 %. Single hammer peening shall
result in a fully covered hammered groove where the surface is smooth with uniform indentation.
All traces from previous grinding shall be completely removed. Благодарю за помощь!
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