Dressing by TIG or plasma

(1) While TIG welding is only a practical process for structures made of plates 4mm thick or less, it can be used for improving the fatigue strength in cases where the weld toe is the critical site. When re-melting the existing toe region inclusions and undercuts can be removed and the toe radius can be increased which reduces the local stress concentration factor.

(2) Standard TIG dressing equipment can be used, without the addition of any filler material. TIG dressing is sensitive to operator skills and it is important to have clean surfaces to avoid pores. Detailed procedures must be worked out.

(3) The improvement must be verified by tests.

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