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September 2, 2026Journal of Welding and JoiningOpen Access

Welding and Joining Technologies for Manufacturing of Small Modular Reactors (SMRs): A Review on Processes and Joint Integrity

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Authors

YKYoung‐Min KimIHIn Sung Hwang

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Overview

Review examines welding and joining processes for small modular reactor fabrication, highlighting advanced methods to optimize structural integrity and manufacturing efficiency.

Key Points

  • To evaluate conventional and advanced welding and joining technologies utilized in small modular reactor fabrication, focusing on process characteristics and structural joint integrity.
  • Reviewed conventional arc welding techniques (GTAW, GMAW) alongside advanced high-energy and solid-state processes (laser beam, electron beam, friction stir, and narrow gap welding).
  • Assessed joining requirements across critical reactor components—including pressure vessels, heat exchangers, and piping—in relation to non-destructive evaluation and powder metallurgy hot isostatic pressing (PM-HIP).
  • Advanced joining processes such as electron beam and narrow gap welding substantially accelerate fabrication rates and reduce thermal distortion in heavy-section nuclear components.
  • Ensuring long-term structural integrity requires targeted mitigation of defect formation, residual stress, creep, fatigue, and fracture vulnerability across weld interfaces.
  • Complementary manufacturing via powder metallurgy hot isostatic pressing decreases overall weld volume but introduces distinct interface-related inspection and mechanical challenges.

Cite This Study

Kim et al. (2026) studied this question.

synapsesocial.com/papers/6a97e2c5c562ede874ec713ehttps://doi.org/10.5781/jwj.2026.44.4.6
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