Biblatex Biber numeric Formatierung

\documentclass[paper=a4,fontsize=11pt,parskip=half]{scrreprt} 
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage[babel,german=guillemets]{csquotes}
\usepackage[backend=biber, bibencoding=utf8, style=numeric, isbn=false,hyperref=auto,firstinits=true,useprefix=true, maxbibnames=2,abbreviate=false,defernumbers=true]{biblatex}

\addbibresource{LitDaten.bib}

\renewcommand*{\newunitpunct}{\addcomma\space}%Komma statt Punkt
\DefineBibliographyStrings{ngerman}{andothers = {{et\,al\adddot}},}%et al statt u.a.
\renewcommand{\labelnamepunct}{\addcolon\space} %Doppelpunkt statt Komma hinter Autoren
\AtBeginBibliography{\renewcommand*{\mkbibnamelast}[1]{\textsc{#1}}} %Autor Name in Kapit"alchen
\DeclareFieldFormat{title}{#1} %Titel nicht kursiv (standard)
\DeclareNameFormat{sortname}{last-first}

\begin{filecontents}{LitDaten.bib}
 @BOOK{buch,
  author = {Fährenwaldt, Hans J and Schuler, Volkmar},
  title = {Praxiswissen Schweißtechnik},
  year = {2003},
  volume = {2.},
  publisher = {Springer New York}
}
\end{filecontents}

\begin{document}

Zitat Buch: \cite{buch}

\printbibheading
\printbibliography[type=book,heading=subbibliography,title=B"ucher]
\printbibliography[type=misc,heading=subbibliography,title={Normen, Standards}]
\printbibliography[type=online,heading=subbibliography,title={Online Quellen}]
\printbibliography[nottype=book,nottype=online,nottype=misc,heading=subbibliography,title={Weitere}]

\end{document}