Title:
WELDING PROCESS FOR MOLTEN SALT PIPELINE IN TOWER-TYPE PHOTOTHERMAL POWER GENERATION IN HIGH-COLD AREA
Document Type and Number:
WIPO Patent Application WO/2021/179675
Kind Code:
A1
Abstract:
A welding method for a molten salt pipeline in tower-type photothermal power generation in a high-cold area, comprising the following steps: processing V-shaped grooves; sealing pipes and introducing argon gas to the grooves; pairing the two pipes by using an aligning pipe clamp; sealing the V-shaped grooves by using high-temperature tin foil paper; preheating two adjacent sides of the V-shaped grooves; performing backing welding and cosmetic welding by means of manual tungsten argon arc welding, and performing filling by means of manual electric arc welding; using multi-layer and multi-pass welding in a welding process, and controlling the temperature between layers not to be higher than 60℃ in the welding process; polishing each layer by using a polishing sheet; after welding, performing welding joint self-inspection, after self-inspection, heating the welding joint to 875-890℃ at a constant rate, then maintaining the constant temperature for not less than 1.5 hours, and after the maintaining of the constant temperature is completed, naturally cooling the welding joint in the air. The welding method can effectively overcome many welding defects such as incomplete penetration, pores, intergranular corrosion, undercut cracks, etc., generated in the welding process of a molten salt pipeline in a tower-type photothermal project in a high-cold area.
Inventors:
ZHANG CHONGYANG (CN)
CHENG WENJUN (CN)
LIU YUBO (CN)
SUN SHENGJIE (CN)
YAN ZHANGSHENG (CN)
XIE YI (CN)
WANG CHENGUANG (CN)
HE YUJIE (CN)
CHENG WENJUN (CN)
LIU YUBO (CN)
SUN SHENGJIE (CN)
YAN ZHANGSHENG (CN)
XIE YI (CN)
WANG CHENGUANG (CN)
HE YUJIE (CN)
Application Number:
PCT/CN2020/130825
Publication Date:
September 16, 2021
Filing Date:
November 23, 2020
Export Citation:
Assignee:
POWERCHINA SEPCO1 ELECTRIC POWER CONSTRUCTION CO LTD (CN)
International Classes:
B23K9/235; B23K9/167
Domestic Patent References:
| WO2012014932A1 | 2012-02-02 |
Foreign References:
| CN111618400A | 2020-09-04 | |||
| CN105728908A | 2016-07-06 | |||
| CN106312354A | 2017-01-11 | |||
| CN102489842A | 2012-06-13 |
Other References:
QIU PING: "Welding technology for tp347h thick-walled seamless steel pipe", PETRO-CHEMICAL EQUIPMENT TECHNOLOGY, vol. 32, no. 3, 31 May 2011 (2011-05-31), pages 17 - 21, XP055847757, ISSN: 1006-8805
WENTAO LIN: "Discussion of SA213-TP347H Welding Technology Control", CHEMICAL INTERMEDIATES, 31 January 2017 (2017-01-31), pages 66 - 67, XP055847758, ISSN: 1672-8114
WENTAO LIN: "Discussion of SA213-TP347H Welding Technology Control", CHEMICAL INTERMEDIATES, 31 January 2017 (2017-01-31), pages 66 - 67, XP055847758, ISSN: 1672-8114
Attorney, Agent or Firm:
JINAN SPRINGS PATENT&TRADEMARK OFFICE (CN)
Download PDF: