It said it might apply temporary anti-dumping duties to protect the domestic industry based on preliminary investigation results.
The ministry called on businesses that export, import, distribute, or use the products under investigation to register as related parties and provide necessary information to safeguard their rights and interests.
It warned it could also impose duties retroactively for 90 days and so enterprises signing import contracts should consider the possibility of their products being subjected to retroactive duties and temporary anti-dumping duties.
On May 11 last year, the Trade Remedies Authority of Vietnam received a request from Kim Tin Group Corporation, a welding materials manufacturing and trading company, to investigate and take anti-dumping measures on welding materials imported from the three countries.
The agency said Kim Tin has clear proof of dumping and losses caused to domestic producers.