Tinker a little, modify all the tools, build a smeltery, then tinker a little more. The classic modular tool mod.

Requires SlimeKnights Library Mod: Mantle
Recommended to include the a recipe viewer: Just Enough Items
Support Tinkers' Construct on patreon:

Tinkers' Construct is a mod about putting tools together in a wide variety of ways, then modifying them until they turn into something else. The tools never disappear and can be named and changed to your heart's desire. Once you make them, they're yours forever. Many different materials can be used to make your tools.
This mod includes many related features, including:
To get started, craft Materials and You then follow the introduction steps. For a more detailed overview, see one of the following links:
The mods binaries, as well as its textures and code are licensed under the MIT License.
Feel free to use the mod in any modpacks. You are allowed to use it, you do not need to ask for permission, in fact permission requests will usually be ignored. When using the mod, please use the Curse/CurseForge, Modrinth, or GitHub download and do not rehost the files.
Any modpack which uses Tinkers' Construct takes full responsibility for user support queries.
For anyone else, we only support official builds from Curse/Curseforge, Modrinth, and GitHub. No custom built jars. We also do not take bug reports for outdated builds of Minecraft.
This project currently has builds for 1.18.2+ along with 1.6.4, 1.7.10, 1.12.2, and 1.16.5. If you are using a Minecraft version other than that which has a Tinkers release, make a request on our discord and I will upload the older build.
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