dryer plug adapter for welder

Hi I recently purchased a chicago electric 170A MIG welder. It runs on 240V and it draws 20A (single phase) but it has a 50a plug on it (nema 6-50). My dryer outlet is a four prong 240v 30a outlet (nema 14-30). So, my question is can I use this adapter? It states in the Amazon product description: