X 断面部材の溶接割れに関する研究(第 1 報) : 拘束度について

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In recent year the tower for transmission line has been growing bigger and bigger. The X section members connected together with angle steels seem to be effective as the main post members of large size towers. Since the steel makers are not interested in rolling X section steel, the X section members have to be built up by welding. The results of pilot test clarified that the intermittent weld might be an adequate operation, because the continuous weld brought about distortions and torsional displacements to the products. The weld cracking comes, however, into question in fabricatiog the X section members with the intermittent method. The experiments were carried out mainly to make clear the intensity of restraint (K) on the weld joints in X section model specimens and to explain the correlation between K of the X section members and that of the usual cracking test specimens (Tekken, Lehigh and RRC). And yet the intensity of restraint K is defined as the force per unit weld length when the root gap of weld joint narrows elastically as much as 1mm, The results are summarized as follows : (1) The gradient of the linear line (θ) in the loading process equals to that in unloading process in P-S test. Then, the intensity of restraint K seems not to change even if the restraint bead suffers from a considerable plastic deformation. (2) It became evident quantitatively that K suffered remarkable effects from the number of beads, weld pitch, weld length and the angle steel size. (3) The correlation between K of the X section members and those of various cracking test specimens could be established.
社団法人溶接学会の論文
1968-10-25

X 断面部材の溶接割れに関する研究(第 1 報) : 拘束度について

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