1. To cause things to combine or blend and become one thing or substance, or be combined or blended in this way.
2. A blend of melt and weld.

• Melt: To change a substance from a solid to a liquid state by heating it or to dissolve something; such as, sugar in a liquid; or to be dissolved in a liquid.
• Weld: To join pieces or parts of some material together by heating them and hammering or using other pressure to make them fuse together.