1983 Volume 69 Issue 8 Pages 990-997
The influence of the electron beam welding condition on the strength of welded joint in maraging steel sheets having strength level of 250kgf/mm2 has been studied. The influence has been discussed on the basis of the variation of the welding heat input and the width of weld metal under various welding conditions.
The strength of heat affected zone is equal to that of the base metal.The strength of weld metal is lower than that of the base metal and is not affected by the welding heat input. Therefore, the joint is such that the weld metal of lower strength is inserted between the base metal having higher strength.
The strength of the welded joint decreases gradually with the increase in the welding heat input. The plastic deformation of the weldment concentrates in the weld metal and in tensile test specimens fail there. On the other hand, the width of weld metal becomes wider with the increase in the welding heat input. Thus, the dependence of the strength of the welded joint on heat input can be explained by the fact that the plastic constraint of the base metal for the weld metal decreases with the increase in the width of the weld metal.