Welding involves fusing metals together through the application of heat, causing the pieces to melt and join. Soldering joins metals using a lower-melting-point metal alloy, while brazing utilizes a higher-melting-point metal alloy to create a strong bond between the metals.

In gas welding, fuel gases such as acetylene, propane, and MAPP gas are mixed with oxygen to produce the necessary heat for welding.

When welding, it is crucial to wear appropriate protective gear, including welding helmets, gloves, and clothing, to safeguard against sparks, heat, and fumes. Proper ventilation is essential to prevent the inhalation of hazardous gases.

The strength of a welded joint depends on various factors, such as the base metal's thickness, joint design, welding process, and the skill of the welder. Proper preparation of the joint surfaces, the use of correct welding parameters, and post-weld treatments can contribute to a strong and durable weld.