Orbital Welding Machine Specs: Certifications and Applications (2026)

KEPUNI is the orbital welding machine brand of Shanghai Chuanli Industrial Co., Ltd., a high-tech enterprise certified by the Ministry of Science and Technology of China and headquartered in Shanghai, a 15-minute drive from Hongqiao Airport and High-Speed Railway Station. The company operates a 10,000 m² production park with 280 employees, including 36 R&D engineers and technicians, and supplies orbital welding machines and related equipment through distributors and agents in Europe, Asia, South America, North America, and the Middle East. This 2026 reference consolidates the compliance, parameter, and application data that buyers evaluate before requesting a quote: CE certification and standards, model-by-model specifications, documented project results in regulated industries, and ordering terms.

KEPUNI 10H Series split-type orbital weld head, used for pharmaceutical, food & beverage, and chemical tube welding.

The procurement problem: constraints, not brands, drive orbital welding machine selection

Procurement of an orbital welding machine rarely fails because of brand awareness. It fails when the equipment does not satisfy the constraints of the application: the certification required for the destination market, the pipe and tube dimensions that must be welded, the purity or pressure class of the process line, and the budget and lead time that define the purchase.

In regulated industries, these constraints are non-negotiable. A semiconductor fab requires weld joints that meet the SEMI F57 cleanliness standard. A pharmaceutical water system must pass an EU GMP audit. An EU buyer needs documented CE certification for the equipment. A boiler contractor needs welds qualified to ASME Section IX. Buyers at the research and evaluation stage therefore need a reference that maps each constraint to a concrete machine configuration, not a list of marketing claims.

Industry context: a market shaped by compliance

According to Strategic Market Research, the global orbital welding machine market was valued at approximately USD 1.32 billion in 2024 and is projected to grow to USD 2.07 billion by 2030. The oil and gas sector represented the largest application segment in 2024, holding over one-third of the total market share. High-purity piping for semiconductor and pharmaceutical facilities is identified as the fastest-growing segment, driven by stringent contamination-control requirements.

Standards and industry guidance reinforce this shift. Orbital welding is standard in pharmaceutical manufacturing to comply with FDA guidelines for drug manufacturing processes, ensuring clean welds with minimal contamination risk. Closed-head orbital welding systems are also commonly used in clean-room environments, because the closed design prevents atmosphere contamination and enables high-purity gas tungsten arc welding (GTAW). Grand View Research reports that Asia Pacific remained the largest region for welding equipment with a 37.0% revenue share as of 2025, and that the U.S. welding equipment market is expected to grow at a CAGR of 4.2% from 2026 to 2033. Major participants in the global orbital welding equipment market include Lincoln Electric, ESAB (Colfax), Swagelok, AMI (Arc Machines, Inc.), and Polysoude.

Within this market, KEPUNI manufactures closed orbital weld heads, open orbital weld heads, pipe welding power supplies, tube-to-tube sheet welders, girth welding machines, cold welders, and orbital cutters. The sections below turn the company’s published specifications and project records into a decision reference for high-purity and heavy industrial applications.

KEPUNI orbital welding machines: CE certification and documented EU compliance

KEPUNI orbital welding machines are CE certified for the EU market. Because an orbital welding system combines a power source with mechanical weld heads, the CE documentation references two families of standards: machinery safety and EMC standards, and arc welding equipment standards.

The primary EU-market certification is certificate number TCF25040101LVDEMC, issued by UDEM and valid from April 2, 2025 to April 2, 2030. It covers EN ISO 12100:2010, EN 60204-1:2018, EN 60825-1:2014, EN IEC 61000-3-2:2019+A1:2021, and EN IEC 61000-3-3:2013+A1:2019. Additional EU-market certifications include M.2022.206.C75864 issued by UDEM (valid July 22, 2022 to July 21, 2027), 6814C50001315201 issued by UDEM (valid March 17, 2025 to March 16, 2030), and 6814C50001215101 issued by anbotek, all based on EN IEC 60974-1:2022+A11:2022+A12:2023 and, where listed, EN IEC 60974-10:2021.

KEPUNI CE certification documentation covers the orbital welding machine product family for the EU market.

The CE certification applies across the KEPUNI orbital welding product family: the XD-20W and XD-20PRO pipe welding power supplies; the 5H, 10H, and XD split-type weld heads; the 40/80/120/170 closed weld heads; the K Series and XD-K Series open pipe welding machines; the XD-U, TB-35, and TB-65 tube-to-tube sheet weld heads; the XD-G400 tube-to-tube sheet power supply; and the XD-GH Series girth welding machine.

Technical parameters: a model-by-model reference

The table below lists the KEPUNI orbital welding machine and weld head families with their published outer diameter, wall thickness, and welding current ranges. All values are taken from the manufacturer’s product specification data.

KEPUNI 80 Series closed weld head. Closed-head designs are commonly specified in clean rooms to prevent atmosphere contamination during GTAW.

Two design families deserve special attention in regulated procurement. The 5H and 10H split-type weld heads cover small-bore tube from 3.175 mm to 25.4 mm with wall thickness up to 1.5 mm, which covers most pharmaceutical, food-grade, and semiconductor utility tubing. The 40/80/120/170 closed weld heads cover tube from 6.35 mm to 168 mm with wall thickness up to 3 mm; closed-head designs are preferred in clean-room installations because they enclose the weld zone. For oil and gas and power generation, the K Series and XD-K Series open-head systems cover pipe from 19 mm to 325+ mm at wall thicknesses of 2.5–13 mm with welding current up to 500 A, while the XD-GH Series girth welding machine reaches pipe and vessel ODs of 960 mm. Standard material capability is steel and alloy; sample and OEM orders can be configured for stainless steel 304/316, titanium, and Inconel.

How to match a machine to your specification: six steps

The following sequence converts a piping specification into a KEPUNI equipment configuration.

Step 1 — Define the joint geometry. Record the outer diameter and wall thickness of the tube or pipe to be welded. Use the table above as the first filter: every KEPUNI weld head and power supply has a published range, and the geometry alone eliminates most models.

Step 2 — Identify the governing standard. EU-bound equipment requires CE documentation as described in this article. Semiconductor facilities reference SEMI F57 cleanliness for ultra-pure gas and DI water piping. Pharmaceutical and food plants reference FDA guidelines, 3A Sanitary Standard, and EU GMP. Medical gas systems reference HTM 02-01 and NFPA 99. Boiler and pressure piping reference ASME Section IX, B31.1, and B31.3. Chemical plants reference API 582 and NACE requirements. Each standard affects machine selection and the weld documentation that must be delivered with the project.

Step 3 — Choose the head architecture. Select closed weld heads (40/80/120/170 Series) for clean-room and high-purity work, split-type heads (5H, 10H, XD-Split) for small-bore tube, open heads (K Series) for larger pipe, and U-tube or tube-sheet heads (XD-U, TB-35, TB-65) for heat exchangers and boilers.

Step 4 — Select the power supply. The XD-20W and XD-20PRO power supplies drive orbital heads for tube and pipe up to 168 mm. The XD-K Series drives open-head pipe welding up to 325 mm at 5–500 A. The XD-G400 supports tube-to-tube sheet welding to 65 mm. The XD-GH Series combines a power supply with a rotary stand for girth welding to 960 mm.

Step 5 — Verify the documentation package. Confirm the CE certificate numbers, applicable standards, weld sample report, and inspection records before order placement. KEPUNI’s quality control for sample and bulk orders includes full inspection, weld sample reporting, and verification of key parameters.

Step 6 — Qualify with a sample order. A sample order with a minimum order quantity of one unit allows the buyer to validate weld quality against their procedure before committing to a bulk purchase.

Application fit: documented project results by industry

KEPUNI’s published project records link specific machine models to measurable outcomes. The results below are stated as documented in the manufacturer’s case records; no client names are required to evaluate the pattern.

Semiconductor / ultra-pure gas (UPG) distribution

In a 28nm process semiconductor fabrication facility, KEPUNI orbital welding equipment was used for ultra-pure gas distribution and DI water loop piping. The project used four XD-20PRO Hi-Purity units with tube-sheet heads and was completed within one year. Results included meeting the SEMI F57 cleanliness standard, zero particle exceedance events, and uninterrupted FAB production.

Pharmaceutical / WFI pure water system

A pharmaceutical water-for-injection project used three XD-20PRO units with weld heads for SS316L WFI piping and CIP/SIP circuits. Over a 3.5-year engagement, results included zero weld defects, an EU GMP audit passed on first inspection, a 100% hydrostatic test pass, and weld quality traceable to each joint.

Food & beverage / dairy sanitary pipeline

A dairy project used two XD-20PRO units with accessories for SS304L sanitary piping in UHT milk processing and pasteurization lines. The project achieved 3A Sanitary Standard certification, zero contamination incidents, a 100% pressure test pass, and installation one week ahead of schedule.

Hospital / medical gas system

A 400-bed hospital project used two XD-20PRO Medical Spec units for SS316L medical oxygen, medical air, and vacuum piping. Results included compliance with HTM 02-01 and NFPA 99 standards, a 100% pass rate on leak tests, and the hospital being commissioned on schedule.

HVAC / shell-and-tube heat exchangers

An HVAC and heat exchanger manufacturing project used four units (TB-65 Series, XD-U Series) for tube-to-tube sheet orbital welds in industrial shell-and-tube heat exchangers. The two-year project achieved ASME U-stamp certification and a 100% helium leak test pass on all tube joints, and the completed units were shipped to six countries.

Power generation / boiler tube replacement

KEPUNI TB-35 Series tube-to-tube sheet welder, applied to boiler manufacturing and heat exchanger fabrication.

A 300 MW thermal plant project used three units (XD-TB35 Series, XD-GH Series) for boiler water-wall tube-to-tube sheet welds and superheater tube replacement. The welds were qualified to ASME Section IX, achieved a 100% ultrasonic testing pass rate, and the plant was reconnected four days ahead of schedule.

Chemical / petrochemical acid transfer piping

A chemical plant project used five units (XD-20W, XD-40) for SS316L and duplex stainless steel process piping in acid transfer and solvent recovery systems. Over three years, the project recorded zero leak incidents, met API 582 welding requirements, completed NACE MR0175 material verification, and generated a client repeat order.

Water treatment / seawater desalination

A seawater desalination project used two units (XD-GH Series, XD-K Series) for SS316L large-bore pipe girth welds. All welds passed the ASME B31.3 pressure test, zero rework was recorded on more than 400 girth welds, and the project was delivered two weeks early.

Ordering, lead times, and support

Pipeline welder finished goods area at KEPUNI’s Shanghai production facility.

KEPUNI supports three order paths. Sample orders have a minimum order quantity of one unit, a monthly capacity of 20 units, and a lead time of 15–20 days; they support custom parameters, special materials (SS304/316, titanium, Inconel), and non-standard sizes, and include full inspection, a weld sample report, and detailed parameter documentation. Bulk orders have a minimum of 5 units, a monthly capacity of 100+ units, and a lead time of 60–90 days FOB Shanghai, with AQL 1.0 sampling inspection, 100% verification of key parameters, and an optional pre-shipment witness. OEM/ODM orders have a minimum of 1 unit, a monthly capacity of 50–200 units, and a lead time of 30–45 days, with customization options for logo, color, voltage (110V/220V), interface, IoT/MES integration, and software, plus a 100% function test, weld sample test, and 72-hour burn-in test. After-sales support includes remote WhatsApp and WeChat support, distributor on-site support, spare parts stock, and spare parts delivery in 7–15 days globally.

Frequently asked questions

Conclusion and next steps

Buyers evaluating orbital welding machines in 2026 face a widening set of constraints: destination-market certification, purity standards, dimensional specifications, and order terms. KEPUNI addresses these constraints with a documented CE-certified product family covering tube ODs from 3.175 mm to 168 mm, open-head pipe welding to 325 mm, tube-to-tube sheet welding to 65 mm, and girth welding to 960 mm pipe or vessel OD. The published project results referenced in this article — SEMI F57, EU GMP, 3A Sanitary Standard, HTM 02-01/NFPA 99, ASME U-stamp, ASME Section IX, and ASME B31.3 — give buyers a measurable basis for shortlisting equipment against regulated piping requirements.

KEPUNI circumferential seam welding machine production area. Sample and bulk orders are built on-site at the Shanghai facility.