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Extremely toxic fumes are created when these metals are heated. 4. Connect the work clamp to the work piece or workbench (if metal). Make sure the contact is secure. Avoid surfaces with paint, varnish, corrosion, or non-metallic materials. 5. Position the Heat Selector on the front panel to the desired setting. See application decal inside door of wire feed compartment for proper heat settings. NOTE: These settings are general guidelines only. Heat setting may vary according to welding con