IN-PRODUCT ENVIRONMENTAL-PROTECTION - EVALUATION OF CHEMICAL-EMISSIONS FROM THE SPOT-WELDING JOINING TECHNIQUE IN THE AUTOMOBILE-INDUSTRY .2. LABORATORY PYROLYSIS MEASUREMENTS WITH A WELDING CHAMBER

In the first part of this series we introduced the aim of this work an d the methods used for evaluation of chemical emission when using the combined joining technique of weld bonding. In this part of the public ation we give detailed information of the influence of some parameters on the formation of BTEX (benzene, toluene, ethylbenzene and xylene), PAH (polycyclic aromatic hydrocarbons) and oxo compounds (aldehydes a nd ketones). For this purpose, we developed an experimental set up whi ch is a model for the real process. We investigated the following para meters: thickness and surface treatment of applied steel sheets, lubri cant, type of adhesive agent and the welding current. We tried to find a correlation between the investigated parameters and the formation o f BTEX, PAH and oxo compounds.