JPS5636377A - Laminating method for preventing toe of weld of bead from hardening - Google Patents
Laminating method for preventing toe of weld of bead from hardeningInfo
- Publication number
- JPS5636377A JPS5636377A JP11343679A JP11343679A JPS5636377A JP S5636377 A JPS5636377 A JP S5636377A JP 11343679 A JP11343679 A JP 11343679A JP 11343679 A JP11343679 A JP 11343679A JP S5636377 A JPS5636377 A JP S5636377A
- Authority
- JP
- Japan
- Prior art keywords
- weld
- heat input
- 11sec
- base metals
- carbon equivalent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
PURPOSE: To suppress hardening of the toe of weld of beads and prevent the occurrence of corrosion cracking in weld zone by specifying the carbon equivalent of base metals, preheating temperature and welding heat input at the time of laminating the final pass with the site joint of a spherical storage tank.
CONSTITUTION: In the case of laminating the final pass under the conditions in which welding heat input is ≤24Kj/cm with the site joints of a spherical storage tank, the upper limit of the carbon equivalent of base metals is kept at 0.40%. The threshold cooling time (11sec) when the maximum hardness of the base metals becomes ≤300Hv at the upper limit of this carbon equivalent is obtained, and in order to assure the cooling time 11sec at the minimum heat input quantity (for example, 12Kj/cm), the continuous preheating of 150°C is performed at the preceding bead application of the final pass. While the interpass temperature is being secured at ≥200°C by using the heating by this preceding bead heat input, the final beads are applied. Thereby, the cooling time of the weld bond zone of 800W500°C may be sured for ≥11sec and the joint hardness may be kept at ≤300Hv.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11343679A JPS5636377A (en) | 1979-09-03 | 1979-09-03 | Laminating method for preventing toe of weld of bead from hardening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11343679A JPS5636377A (en) | 1979-09-03 | 1979-09-03 | Laminating method for preventing toe of weld of bead from hardening |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5636377A true JPS5636377A (en) | 1981-04-09 |
| JPH0228435B2 JPH0228435B2 (en) | 1990-06-25 |
Family
ID=14612166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11343679A Granted JPS5636377A (en) | 1979-09-03 | 1979-09-03 | Laminating method for preventing toe of weld of bead from hardening |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5636377A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123350A (en) * | 1976-04-09 | 1977-10-17 | Aioi Seisakushiyo Kk | Welding process and apparatus therefor |
-
1979
- 1979-09-03 JP JP11343679A patent/JPS5636377A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123350A (en) * | 1976-04-09 | 1977-10-17 | Aioi Seisakushiyo Kk | Welding process and apparatus therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0228435B2 (en) | 1990-06-25 |
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