He is doing a weldering with a steel frame.
Weldering increases the strength of steel frame, coupled with bolts and anchors.
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Maruhachi Tent Corporation / （株）丸八テント商会
5-7-10 Sakae Naka-ku Nagoya Aichi Japan
（本社：愛知県名古屋市中区栄 5-7-10）
TEL：81-52-251-6731
Nishijin Carbon, Nishijin Hampu
Online store
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Maruhachi Tent's Blog 