A Proposal Concerning the Automatic Submerged Welding Procedures of Assemblies for Ship's Hull

抄録

In carrying out the welding of the butt joints of the assemblies for ship's hull by means of the automatic submerged arc welding, there arises an important problem of preventing piercing with welding rod during welding process. Against the inaccurate processing of joint edge preparation, which is regarded to be the main cause of piercing, many researches have been conducted and counter-measures have been introduced. However, no satisfactory results have been obtained to date.
Therefore, the authors have devised a new edge form to replace the Unionmelt type edge preparation hitherto in use, thus attempting to solve this problem with its adoption. Known as Kawasaki's Z type, this new form is the improvement of the edge preparation now in practice at the Chantiers de 1' Atlantique in France. In comparison with the edge preparations hitherto in use, this new edge form devised by the authors has greater allowable limit of root opening against piercing with welding rod. Furthermore, it is much easier to make edge preparation. These advantages have been proved by the experiments carried out by the authors.
Moreover, the authors have already applied this new edge form to actual constructions and carried out single pass submerged arc welding to thick steel plates up to the thickness of 60 mm, thus obtaining successful results seen from the stand points of welding efficiency and joint performance.