What is the first step to be taken with paint on the surface of a vessel before welding?

Before welding on a surface that has paint, it is essential to assess the type of paint present, as some paints can release harmful gases or interfere with the welding process if ignited. Sampling the paint involves taking a small piece of the paint material to analyze its composition, ensuring that it does not contain harmful substances, such as lead or other hazardous components.

This initial evaluation helps in deciding how to safely remove the paint and what precautions to take during welding, such as using proper ventilation or specific types of personal protective equipment. After confirming the paint's nature, proper removal methods, such as grinding or chipping, can be implemented to prepare the surface adequately for safe welding operations.