In Islam people cannot eat in gold utensil even if a small amount was used for welding. It becomes unlawful. On the other hand, God has made it permitted for Muslims to use utensils welded with small amount of silver. 

Utensils welded with gold or silver

If gold is used for welding a broken utensil, it becomes unlawful to use, because the aforementioned hadith applies to it. If a small amount of silver is used for welding, it is permissible to use,[1] as clearly understood from the hadith reported by Anas ibn Malik: