Weld Blend Vault
Precision welding, built for Japanese industry.
Weld Blend Vault handles industrial and structural welding contracts across the Kanto region, from single fabrications to multi-phase site work.
Kenji Murakami started Weld Blend Vault in the spring of 2017, after eleven years working as a structural welder and then site supervisor for Toyo Fabrication in Yokohama. The name came from a habit he kept from his early years: a small notebook where he logged every filler metal combination, preheat temperature, and interpass reading from jobs that went well. The vault part was a joke between colleagues, but it stuck. The company launched with two welders, a secondhand Lincoln Electric Power Wave, and a rented bay in an industrial estate off Route 409 in Kawasaki.
The first two years were mostly subcontract work for a mechanical contractor in Tsurumi. In the winter of 2018, a pipe failure at a food processing plant in Sagamihara brought the first direct client relationship. The plant manager needed a repair done over a weekend shutdown, with a written procedure and a hydrostatic test result before Monday morning. Weld Blend Vault delivered both. That job led to a three-year maintenance contract and, eventually, to the decision to invest in a proper workshop space and a second welding bay. The current workshop at 2-14-8 Ogimachi, Kawasaki-ku opened in early 2020.
Filler metal and preheat logged on every weld record, not just on request
WPS qualification done before work starts, not after a failed inspection
Hydrostatic testing completed in-house on all pipe spool assemblies
Workshop in Kawasaki-ku, open Monday to Saturday 08:00-18:00
Kenji Murakami still welds on duplex and thin-wall aluminium jobs personally
Fixed-price quotes issued within two working days for defined scopes
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Request a QuoteEvery plate, pipe, and fitting we use carries a mill certificate. We log material heat numbers against the weld record before any arc is struck.
Our welding procedure specifications follow JIS Z 3040 and are qualified by third-party inspection. We do not improvise on procedure. If a joint requires a new WPS, we qualify it first.
We carry MT and PT equipment on-site and coordinate UT and RT with our inspection partner, Kanto NDT Services in Kawasaki.
Every project leaves with a weld map, welder ID log, and inspection record. Clients keep a full paper trail without having to ask for it.
If you are commissioning welded fabrication in Japan and your inspection body or client requires a…
Japanese industrial clients sometimes specify ASME B31.3 for process piping, particularly when the…
Stainless steel gets its corrosion resistance from a chromium oxide layer on the surface.…
"Kenji Murakami trained as a structural welder at Toyo Fabrication in Yokohama, where he spent eleven years before founding Weld Blend Vault in 2017. During his time at Toyo, he supervised site teams on industrial plant installations across Kanagawa and Shizuoka. He holds JIS Z 3801 certification in manual arc welding and TIG welding, and completed a welding inspection course at the Japan Welding Engineering Society in 2014. He lives in Kawasaki with his family and keeps a small vegetable plot behind the workshop, which the team tends between jobs in the slower winter months."
Most of our work is in Kanagawa and Tokyo, but we have taken contracts in Shizuoka and Ibaraki when the scope justified the travel. For sites further afield, we discuss logistics and accommodation costs openly before quoting. We do not add hidden mobilisation fees.
Yes, for straightforward items. Our draughtsperson can produce a shop drawing from a dimensioned sketch, which we then send back for your approval before fabrication starts. There is a drawing fee for this service, typically ¥15,000 to ¥35,000 depending on complexity.
We work to JIS standards as the default. JIS Z 3040 for procedure qualification, JIS B 8265 for pressure equipment, and JIS Z 3801 for welder qualification. Where clients specify ASME or AWS standards, we can accommodate that provided the relevant WPS is qualified.
A standard bracket set or handrail assembly is usually five to eight working days from drawing approval. Pipe spool sets with hydrostatic testing take eight to twelve days. Complex or large-volume jobs are scheduled individually. We give a realistic lead time in the quote and flag any changes early.