Befote and during the war, the utility of welding technique was scarcely recognized in Japan. Even the responsible experts concerned to production of munitions, they had not the ad, quate appreciation of it. In spite of the above circumstances, some parties of welding engineers and workers did their best and obtained good results on qualities and quantities of the product. Hereafter such their efforts should be more required for the reconstruction works in Japan It is an important problem for urgent solution, that is to say, erection or restoration of factories, harbours, residences, ships, vehicles and the other machines destroyed during the war. And these are examples that depend great deal upon the application of welding. The more welding experts cooperate strongly, the sooner progress of welding technique would be realized. So we must make our every efforts to digest the excellent parts of sciences and arts in America and Europe. In a word we have to make the most of our experimences of hard work in the war, to encourage the promotion of technique and then we are able to find the glorious hope in the cosmopolitanism set up on sciences and arts which are to contribute to the warfare of mankind in the word.