Twitter 拾萬字鏡 JUMANJIKYO | 拾萬字鏡(JUMANJIKYO) /「as the only general-use kanji」の検索結果

溶 (as the only general-use kanji) now usually stands in for all 3. You may often see 溶接 instead of 熔接 like the photo. Since they all contain 容 and are read [you] and the 氵 radical implies liquid, it makes sense and keeps things simple. 👇