炭素鋼・低合金鋼の電子ビーム溶接における低温割れの研究
電子ビーム溶接法に関する研究(第1報)
1986 年 4 巻 1 号 p. 131-137
詳細
1986 年 4 巻 1 号 p. 131-137
The authors researched cold rcacking in electron beam (EB) welding by performing hardness and cracking tests on 28 different types of carbon and low-alloy steels.
Based on the test results, the welding paramteer (PEBW), a factor used to estimate the cold cracking in EB welding, has been determined. The conclusions are summarized as follows;
(1) The maximum Hardness Value (HVmax) of the EB weld can be estimated by equation (1).
HVmax=(1020⋅C+268)±60…………………………………………………………………(1)
where C: the carbon content of the material (wt%)
(2) Restraint stress of EB weld can be estimated by equation (2)
σw=0.007RF……………………………………………………………………………………(2)
where σw: restraint stress (MPa), RF: restraint intensity (N/mm.mm)
(3) The cold cracking in EB weld can be predicted by equation (3)
HVcr=-0.16rf+750…………………………………………………………………………(3)
where Hvcr: the critical hardness value of crack occurrence
rf: restraint coefficient (N/mm2·mm)
(4) The welding parameter (PEBW) can be determined by equation (4)
PEBW=C+l/6375·rf…………………………………………………………………………(4)
when Q≤13500J/cm, without preheating; PEBW=0.475
