Reflow to melt solder or tin plate to relieve surface stress lowers whisker incidence. Paste also acts as an adhesive during component placement and solder reflow. Such hydrogen plasma can be used for fluxless reflow soldering. The boards are then conveyed into the reflow soldering oven. Some JST surface-mount headers are designed to handle higher temperatures of reflow soldering. For larger QFN components, moisture absorption during solder reflow can be a concern. Virtual profiles are created automatically, for both reflow or wave solder machines. Preheat is the first stage of the reflow process. There are three basic types of resistance welding bonds&colon; solid state, fusion, and reflow braze. A high minimum reflow time also provides a margin of safety against oven temperature changes. Some ovens are designed to reflow PCBs in an oxygen-free atmosphere. Printing is followed by pre-heating and reflow (melting). One is to use infrared lamps; this is called infrared reflow. It offers features such as tabbed browsing, improved zoom features, and text reflow.