As you are already loading titling, use its methods:
\documentclass[a4paper,12pt,numbers=noenddot]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage{titling}
\pretitle{\begin{center}\linespread{1.5}\huge\sffamily}
\posttitle{\par\end{center}\vspace{0.5em}}
\begin{document}
\title{Evaluation of Security aspects in a Beer Production company}
\author{Adalbert Uthor}
\date{}
\maketitle
\end{document}
Adjust the value for \linespread to suit your needs and wishes.

If you use the titlepage environment, you can use a similar method:
\documentclass[a4paper,12pt,numbers=noenddot]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage{titling}
\begin{document}
\title{Evaluation of Security aspects in a Beer Production company}
\author{Adalbert Uthor}
\date{}
\begin{titlepage}
\centering
\vspace*{\stretch{1}}
{\linespread{1.5}\huge\sffamily\thetitle\par}
\vspace{4ex}
{\Large\theauthor\par}
\vspace{\stretch{3}}
\end{titlepage}
\end{document}

\parat the end of the title. And remove the pair of braces around it. – Johannes_B Jun 28 '15 at 20:19\textsfto\sffamily. btw, you can find more about titlepages: How to customize my titlepage? – Johannes_B Jun 28 '15 at 20:28