fused the use of u201c fuse u201d and cognate terms herein is in accordance with a dictionary definition of that term namely u201c to liquefy by heat to render fluid to dissolve to melt to unite or blend as if melted together u201d it will be understood that the fused metal shown in this figure and other figures are for illustration purposes as the precise locations of the boundaries between fused and unfused metal cannot be accurately predicted due to many variables that control the melting of the metal the gap in the axial direction between pipe segment 2 and the edge inside the socket welded fitting is a standard practice and it is believed that it reduces residual stresses as used herein u201c axis u201d and cognate terms refer to the longitudinal axis unless a different interpretation is required by the context the gap between socket welded fitting 1 and piping segment 2 in the radial direction is a standard practice makes the construction easier and is due to the difference between the inner diameter of the socket welded fitting 1 and the outer diameter of the pipe segment 2 as shown in fig1 3 and other figures of the drawings these gaps are exaggerated for purposes of illustration failures of this type of joint may initiate at a u201c toe u201d or u201c root u201d of the weld location 9 in fig3 is called a u201c toe u201d and location 10 a u201c root u201d the present invention is believed to be an improvement upon the prior art shown in fig1 3 the first embodiment of the invention is shown in fig4 5 and 6 similar to the prior art configuration this embodiment has modified socket welded fitting 101 the end of the pipe segment 102 inserted inside.