High power Nd:YAG laser welding in manufacturing of vacuum vessel of fusion reactor

Tommi Jokinen (Corresponding Author), Veli Kujanpää

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)

Abstract

Laser welding has shown many advantages over traditional welding methods in numerous applications. The advantages are mainly based on very precise and powerful heat source of laser light, which change the phenomena of welding process when compared with traditional welding methods. According to the phenomena of the laser welding, penetration is deeper and thus welding speed is higher. Because of the precise power source and high-welding speed, the heat input to the workpiece is small and distortions are reduced. Also, the shape of laser weld is less critical for distortions than traditional welds. For welding thick sections, the usability of lasers is not so practical than with thin sheets, because with power levels of present Nd:YAG lasers depth of penetration is limited up to about 10 mm by single-pass welding. One way to overcome this limitation is to use multi-pass laser welding, in which narrow gap and filler wire is applied. By this process, thick sections can be welded with smaller heat input and then smaller distortions and the process seems to be very effective comparing “traditional” welding methods, not only according to the narrower gap. Another way to increase penetration and fill the groove is by using the so-called hybrid process, in which laser and GMAW (gas metal arc welding) are combined. In this paper, 20-mm thick austenitic stainless steel was welded using narrow gap configuration with a multi-pass technique. Two welding procedures were used: Nd:YAG laser welding with filler wire and with addition of GMAW, the hybrid process. In the welding experiments, it was noticed that both processes are feasible for welding thicker sections with good quality and with minimal distortions. Thus, these processes should be considered when the evaluation of the welding process is done for joining vacuum vessel sectors of ITER.
Original languageEnglish
Pages (from-to)349-353
Number of pages5
JournalFusion Engineering and Design
Volume69
Issue number1-4
DOIs
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed

Fingerprint

Laser beam welding
Fusion reactors
Welding
Vacuum
Lasers
Gas metal arc welding
Fillers
Welds
Wire
Austenitic stainless steel
Joining
Light sources

Keywords

  • welding

Cite this

Jokinen, Tommi ; Kujanpää, Veli. / High power Nd:YAG laser welding in manufacturing of vacuum vessel of fusion reactor. In: Fusion Engineering and Design. 2003 ; Vol. 69, No. 1-4. pp. 349-353.
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High power Nd:YAG laser welding in manufacturing of vacuum vessel of fusion reactor. / Jokinen, Tommi (Corresponding Author); Kujanpää, Veli.

In: Fusion Engineering and Design, Vol. 69, No. 1-4, 2003, p. 349-353.

Research output: Contribution to journalArticleScientificpeer-review

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