Heat management in solid free-form fabrication based on deposition by welding

نویسنده

  • Z Jandric
چکیده

Solid free-form fabrication (SFF) based on gas–tungsten arc welding (GTAW) is one of the few rapid prototyping techniques that has the capability to build three-dimensional metallic parts. For this application, a mild steel (AISI 1018) was used. The most important problem in this process was to find the optimal process parameters. The goal is to build complex three-dimensional parts by depositing metal by welding in a form of layers. The building of a three-dimensional part by welding is especially sensitive to inadequate heat input. The traditional way of manually adjusting the heat input cannot be used because of the dynamic changes in the underlying substrate geometry. To investigate this problem a finite element model (FEM) has been developed that correlates the influence of the different underlying substrate geometry to the quality of the welding-based deposition process. The results from the FEM suggested that influence of the geometry is significant and cannot be neglected. Extensive experiments were designed and performed in order to verify the conclusions derived from the results of the FEM. A real-time adaptive controller of the welding parameters is proposed. This controller performs heat management in real time according to the volume changes of the material of the underlying layers in the vicinity of the heat source. In addition, the overall system performance was monitored and recorded by through-the-arc sensing in order to demonstrate the versatility and robustness of the controller.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Solid Freeform Fabrication Based on Micro-Plasma Powder Deposition

This paper presents a solid freeform fabrication (SFF) technique based on micro-plasma powder deposition (MPPD). The relationship between the geometric features of the deposited layers and the welding parameters is investigated. The arc length is controlled through the monitoring of the arc voltage. The result of building parts with functionally graded components by the MPPD process is shown as...

متن کامل

Simulation of Fabrication toward High Quality Thin Films for Robotic Applications by Ionized Cluster Beam Deposition

The most commonly used method for the production of thin films is based on deposition of atoms or molecules onto a solid surface. One of the suitable method is to produce high quality metallic, semiconductor and organic thin film is Ionized cluster beam deposition (ICBD), which are used in electronic, robotic, optical, optoelectronic devices. Many important factors such as cluster size, cluster...

متن کامل

New Way of Process Parameters Optimization in Sff Based on Deposition by Welding

To successfully control the welding process and to make it appropriate for solid freeform fabrication (SFF), it is necessary to fully understand the influence of the welding parameters and the geometry of the substrate on the resulting weld bead dimensions. Extensive experiments with different welding parameters and complex geometrical features such as edges and corners have been designed and c...

متن کامل

Automated Torch Path Planning Using Polygon Subdivision for Solid Freeform Fabrication Based on Welding

A continuous path is one of the most important requirements for solid freeform fabrication (SFF) based on welding. This paper proposes a method for torch path planning applicable to SFF based on welding with an emphasis on minimum human intervention. The suggested approach describes a method based on the subdivision of a two-dimensional (2-D) polygonal section into a set of monotone polygons to...

متن کامل

Shape Deposition Manufacturing

Solid Freeform Fabrication (SFF) processes " rapidly " create three dimensional shapes of arbitrary complex geometries by incremental material deposition of 2 1 / 2 dimensional layers. Automated planning and execution of the fabrication process is possible, and the need for part-specific tooling or fixturing is eliminated. However, there are inherent limitations in the resulting surface quality...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2004