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公开(公告)号：DE69716144T2
公开(公告)日：2003-11-20
申请号：DE69716144
申请日：1997-01-14
Applicant: UNITED TECHNOLOGIES CORP
Inventor： WRABEL PETER , DRAGHI PETER JON
Abstract: Variable polarity welding is used to repair coated articles, particularly gas turbine engine components. The variable polarity welding process is found to remove the coating during the welding process. This permits the elimination of costly steps which would otherwise be needed in the repair process.
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公开(公告)号：DE69716144D1
公开(公告)日：2002-11-14
申请号：DE69716144
申请日：1997-01-14
Applicant: UNITED TECHNOLOGIES CORP
Inventor： WRABEL PETER , DRAGHI PETER JON
Abstract: Variable polarity welding is used to repair coated articles, particularly gas turbine engine components. The variable polarity welding process is found to remove the coating during the welding process. This permits the elimination of costly steps which would otherwise be needed in the repair process.
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公开(公告)号：DE69807892D1
公开(公告)日：2002-10-17
申请号：DE69807892
申请日：1998-06-19
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DRAGHI J , SHURMAN J , SIMARD A , WRABEL PETER
Abstract: A method for preparing a protectively coated, apertured article to be recoated reduces the likelihood that the apertures will become constricted as a consequence of subsequent recoating. The invention, described in the context of a gas turbine engine blade (12) having transpiration cooling passages (34), includes the step of diffusing an auxiliary coating (52) into an existing coating (28) and into the exposed substrate material (26) at the periphery of the passages to form a diffusion zone (54). The blade is then subjected to a stripping agent so that the diffusion zone (54) any undiffused existing coating, and any undiffused auxiliary coating are removed. The method causes a compensatory enlargement of the mouth (44) of each passage so that excess coating that accumulates in the passage mouths during subsequent recoating does not restrict the flow capacity of the passages.
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公开(公告)号：DE69807892T2
公开(公告)日：2003-01-16
申请号：DE69807892
申请日：1998-06-19
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DRAGHI J , SHURMAN J , SIMARD A , WRABEL PETER
Abstract: A method for preparing a protectively coated, apertured article to be recoated reduces the likelihood that the apertures will become constricted as a consequence of subsequent recoating. The invention, described in the context of a gas turbine engine blade (12) having transpiration cooling passages (34), includes the step of diffusing an auxiliary coating (52) into an existing coating (28) and into the exposed substrate material (26) at the periphery of the passages to form a diffusion zone (54). The blade is then subjected to a stripping agent so that the diffusion zone (54) any undiffused existing coating, and any undiffused auxiliary coating are removed. The method causes a compensatory enlargement of the mouth (44) of each passage so that excess coating that accumulates in the passage mouths during subsequent recoating does not restrict the flow capacity of the passages.
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