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  1. Home
  2. Automobiles and Transportation Equipment
  3. セイエン
Automobiles and Transportation Equipment
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セイエン

EstablishmentApril 1961
capital500Ten thousand
number of employees40
addressHiroshima/Kure-shi/1-5-5 Watocho, Onomichi City
phone0823-51-2644
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last updated:Jul 29, 2025
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  • Products/Services(4)
  • catalog(4)
  • news(4)

セイエン Company Profile

A company that inherits the technology to connect.

A city that has developed alongside the sea, Kure City in Hiroshima Prefecture. Known as the city where the battleship Yamato was built, it is said to have been a place where ships for the envoys to Tang China were constructed in ancient times. Additionally, there is a legend from the Heian period that Taira no Kiyomori excavated the Onado Strait in just one day. Founded in this city, where history and legends are intertwined with reliable craftsmanship, our company has reached its 64th year specializing in pipe processing for metal piping parts used in automobiles and machinery. Our unique bending technology, which does not break even with extremely small radii, enables piping in the shortest route within limited spaces. We imbue the pipes that connect parts with our wishes for safety and our unique technology. We support Japan's manufacturing with techniques that only we can provide.

Business Activities

Manufacturing of metal piping components for automobiles and machinery.

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Products/Services (4)

High airtightness joining technology "Airtight Projection Welding" product image
High airtightness joining technology "Airtight Projection Welding"
Leave it to us for cost reduction! High-precision R-bent pipe processing. product image
Leave it to us for cost reduction! High-precision R-bent pipe processing.
Pipe "Ultra Small Radius Bend Pipe" product image
Pipe "Ultra Small Radius Bend Pipe"
Seien Co., Ltd. Business Overview product image
Seien Co., Ltd. Business Overview

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catalog(4)

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Sealed Projection Welding Technology

Sealed Projection Welding Technology

TECHNICAL
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Seien Co., Ltd. Ultra-small R-bend Pipe

Seien Co., Ltd. Ultra-small R-bend Pipe

DOCUMENT
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Pipe "Ultra Small Radius Bend Pipe"

Pipe "Ultra Small Radius Bend Pipe"

PRODUCT
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Seien Co., Ltd. Company Profile

Seien Co., Ltd. Company Profile

COMPANY
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news(4)

ロゴとコピー_ポジ.png

[Application Information] Patent on projection welding technology for airtight piping.

  • PRODUCT

We have filed a patent for a pipe joining method and pipe joint that allows for a high strength of the joint and ensures airtightness by directly joining the base materials without using a filler material.

Jul 29, 2025

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ロゴとコピー_ポジ.png

[Application Information] Patent on Projection Welding of Thin-Walled Pipe Curves

  • PRODUCT

We have filed a patent for a pipe joining method and pipe joint that allows for a high strength at the joint between pipes and ensures airtightness in the joining of thin-walled pipe curved surfaces.

Jul 29, 2025

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【出願情報】気密プロジェクションの商標.jpg

[Application Information] Trademark for Airtight Projection

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We have named our unique technology, which ensures high joint strength and high airtightness through projection welding, "Airtight Projection" and have applied for a trademark.

Jul 29, 2025

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Detailed information

Company name セイエン
number of employees40
Contact addresspostalcode 737-1217 Hiroshima/ Kure-shi/ 1-5-5 Watocho, Onomichi CityView on map TEL:0823-51-2644 FAX:0823-51-2671
Key PartnersSamsung Manufacturing, Tokyo Radiator Manufacturing, Asahi Trading, Micro Techno, Boltz, Funakoshi Iron Works, Matsumoto Heavy Industries, Hiroshima Aluminum Industry, Yamazaki Metal Industry, Kodera Manufacturing, Olipp, Sankin, etc.
Industry Automobiles and Transportation Equipment
セイエン Building Image
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