Abstract:
The welding can be carried out only after the partial removal of a necessary aluminized portion prior to welding an aluminized component.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to PCT Application No. PCT/EP2014/058064, having a filing date of Apr. 22, 2014, based off of European Application No. 13166930.1 having a filing date of May 8, 2013, the entire contents of which are hereby incorporated by reference. 
     FIELD OF TECHNOLOGY 
     The following relates to the welding of aluminized components and to an aluminized component. 
     BACKGROUND 
     Gas turbine components such as burner components have steels which are aluminized in order to improve their corrosion properties. 
     Hitherto, such components were not repaired. 
     SUMMARY 
     An aspect relates to a method by means of which aluminized components can be repaired or welded. 
     By virtue of the method features and the component features, aluminized components can be welded or have an advantageous weld. 
    
    
     
       BRIEF DESCRIPTION 
       Some of the embodiments will be described in detail, with reference to the following figures, wherein like designations denote like members, wherein: 
         FIG. 1  shows schematically a sequence of an embodiment of a method and an embodiment of a component. 
     
    
    
     DETAILED DESCRIPTION 
     A substrate  4 , in particular made of a steel, very particularly made of 16Mo3, is to be welded or repaired. 
     In that context, aluminized (+Al) is carried out in a first step, which produces a diffusion layer  6  within the substrate  4 , converting this into a modified substrate  4 ′, and generates a build-up layer  7 . 
     Aluminizing can also be carried out only locally. 
     The diffusion layer  6  preferably has a depth of 150 μm to 300 μm. 
     The build-up layer  7  preferably has a thickness of 100 μm. 
     One part of the build-up layer  7  is in particular locally removed from the surface  13  of the diffusion layer  6  such that only a remnant  7 ′ of the build-up layer is present, wherein the build-up layer is largely, in particular entirely, removed with respect to its thickness and thus a surface  13  of the diffusion layer  6  forms an outer surface. The local removal of the build-up layer is expedient if only part of the aluminized surface of the substrate  4 ′ is to be welded. 
     In the next step, the exposed region  11  of the surface  13  is provided with a weld  10 . 
     The procedure according to the prior art was to remove only the oxidized surface of aluminum of the build-up layer  7 . 
     The removal of part of the build-up layer  7  can be carried out chemically and/or mechanically and/or by laser ablation. 
     The weld  10  can be used to weld together burner components or to build up material in order to increase wall thickness. 
     The repaired component has, next to one another, a substrate  4 ′ having a diffusion layer  6  and a weld  10  on the diffusion layer  6  together with a build-up layer  7 ′ on the surface  13  of the diffusion layer  6 .