Defense / Mil-Spec Welding
Mil-Spec Welding Services for Defense Applications
Defense Welding is our specialty. Our NADCAP approved defense welding services allow us to perform welds on components for most components.
Specializing in Defense Welding Services
At Lynn Welding, we specialize in defense welding services for the defense and military industry. Military spec welding is a United States military welding standard that is used as a basis for quality assurance. This assures the optimum quality of the weld and validates the capability and repeatability of a resistance welding machine used where weld quality is vital in the manufacturing of critical parts, as in the defense and military industries.
Designing and fabricating components for the defense industry is a high-risk endeavor, and our clients trust that we will meet their needs with customized solutions all while keeping costs to a minimum and keeping the highest quality standards. We understand the rigorous standards and deadlines that must be met in the defense welding industry and we strive to meet and exceed these for every project!
Quality Mil-Spec Welding Services
At Lynn Welding, we perform rigorous quality inspections on all of defense welding services projects. Lynn welding holds an extensive list of qualifications from a broad list of customers and is extremely well respected within the aerospace community when it comes to producing mil-spec welding services.
Lynn Welding's Defense / Mil-Spec Welding Approvals

Raytheon
Lynn Welding is a well known Raytheon Approved Welding company when it comes to welding and machining for the Aerospace, Defense, Nuclear, Industrial, and Medical industries.
Raytheon Approved Fusion Welding
- D17.1 (Specification For Fusion Welding For Aerospace Applications)
- WS33739 (Process Specification For Aerospace Fusion Welding)
- AWS D1.1 (Carbon Steel)
- AWS D1.2 (Aluminum)
- AWS D1.3 (Structural Welding Code - Sheet Steel)
- AWS D1.6 (Stainless Steel)
- AWS D9.1 (Sheet Metal)
Raytheon Approved Resistance Welding

Boeing
Lynn Welding holds a certification from Boeing for Fusion Welding & Resistance Welding. All Procedures are GTAW-MA (Gas Tungsten Arc Weld-Manual)
Boeing Approved Fusion Welding
- D1-4426 (Processor Basic Quality System for D1-4426 approval only Quality System)
- BAC 5975 (Fusion Welding - CRES Heat Resist Nickel - Cobalt Alloys BAC 5975)
- MIL-STD-2219 (Fusion Welding for Aerospace Applications - Aluminum Alloys MIL-STD-2219)
- BAC 5975 (CRES Heat Resist Nickel - Cobalt Alloys)
- AMS-STD-2219 (Aluminum Alloys)
- MIL-W-8604 (Aluminum Alloys MIL-W-8604)
Boeing Approved Resistance Welding

Nadcap
Lynn Welding holds a NADCAP-Approved Welding Certification for Resistance Welding, Fusion Welding, & more.
Nadcap Approved Fusion Welding
- PWA 16 (Pratt and Whitney Approved) (GTAW Welding)
- BAC 5975 (Boeing Approved) (GTAW Welding)
- CPW 24 (Pratt and Whitney Canada Approved) (GTAW Welding)
- AWS D1.3 (GTAW Welding)
- AWS D1.4 (GTAW Welding)
- AWS D1.6 (GTAW Welding)
- AWS D1.9 (GTAW Welding)
- BPS 4404 (Bell Approved) (GTAW Welding)
- AMS-ST0-2219 (ULA Approved) (GTAW Welding)
- AWS D1.1 (GTAW Welding)
- Gamps 2302 (Gulfstream Approved) (GTAW Welding)
- HS 191 (UTAS Approved, Formerly Hamilton) (GTAW Welding)
- AWS D1.2 (GTAW Welding)
- Ground Combat Vehicle Welding Code 12479550 (GTAW Welding)
- EPS 14530 (Rolls Royce Approved) (GTAW Welding)
- P8TF3 (GE Aviation Approved) (GTAW Welding)
- D17.1 Class A, B and C (GTAW Welding)
- Mil-STD-2219 Class A, B and C (GTAW Welding)
- AMS 2685 (TIG Welding)
Nadcap Certified Brazing
Nadcap Approved Brazing

Bell Helicopter
Lynn Welding is Bell Helicopter approved for Resistance Welding and Fusion Welding processes, and preparation of metals.
Bell Helicopter Approved Fusion Welding
Bell Helicopter Approved Resistance Welding

General Electric
Lynn Welding holds a certification from GE Aviation for Fusion Welding, Brazing, & Resistance Welding.
General Electric Approved Fusion Welding
- CS00 (Titanium Welding)
- M50T1 (CS – Welding all Processes)
- P8TF3 (Gas Shielded Arc Welding)
- P8TF11 (Gas Tungsten Arc, Gas Metal Arc And Plasma Arc Welding)
- P21TF6 (In-Process Welding Of Castings)
General Electric Approved Brazing
General Electric Approved Resistance Welding

Rolls-Royce
We are Rolls Royce Corp. Sub Tier Supplier (RRU6) for Fusion Welding and Resistance Welding, Spot and Seam
Rolls-Royce Approved Fusion Welding
- AWS D17.1 (AWS D17.1 Fusion Welding)
- EDS 1306 (EDS 1306)
- EPS 14500 (EPS 14500)
- EIS 1200 Acceptance Criteria for Fusion Welding (EIS 1200 Acceptance Criteria for Fusion Welding)
- EPS 14530 Fusion Welding (EPS 14530 Fusion Welding)
Rolls-Royce Certified Resistance Spot Welding

Collins Aerospace (Hamilton Sunstrand / UTAS)
All Procedures are GTAW-MA (Gas Tungsten Arc Weld-Manual)
Collins Aerospace (Hamilton Sunstrand / UTAS) Approved Fusion Welding
Collins Aerospace (Hamilton Sunstrand / UTAS) Approved Resistance Welding
- AWS D17.2 (Resistance Welding Certification for Aerospace)
- AMS-W-6858 (Resistance Welding of Aluminum, Magnesium, Nickel, & Titanium)
- HS 3944 (Resistance Welding)
- HS 91 (Resistance Welding)
- Mil-W-6858 (Mil-Spec Resistance Welding)
- SAE-AMS-W-6858 (Mil-Spec Resistance Welding)
Collins Aerospace (Hamilton Sunstrand / UTAS) Approved Brazing

Kaman Aerospace
Approved by Kaman Aerospace for Fusion Welding, Resistance Stitch Welding, Resistance Seam Welding.
Kaman Aerospace Approved Fusion Welding
Kaman Aerospace Approved Resistance Welding

Gulfstream
All Procedures are GTAW-MA (Gas Tungsten Arc Weld-Manual)
Gulfstream Approved Resistance Welding
Gulfstream Approved Material Testing
- 5.04 Material Test, Physical (5.04 Material Test, Physical)
- 5.03 Material Test, Metallographic (5.03 Material Test, Metallographic)
Gulfstream Approved Fusion Welding

Pratt & Whitney
Lynn Welding is a LCS Approved Welding Facility for Fusion Welding, Resistance Welding, and Tack Welding.
Pratt & Whitney Approved Brazing
Pratt & Whitney Approved Fusion Welding
- PWA 16-1 (Carbon and Low Alloy Steels)
- PWA 16-2 (Corrosion-resistance steels other than Precipitation Hardenable)
- PWA 16-22 (Precipitation Hardenable, Corrosion-resistance steels)
- PWA 16-222 (Cres. Precipitation Hardenable Alloys)
- PWA 16-3 (Nickel and Non-precipitation Hardenable Nickel Alloys)
- PWA 16-33 (Precipitation Hardenable Nickel Alloys)
- PWA 16-37 (Ni & Non Precip. Hard. Nickel Alloys Welded To Cobalt Alloys)
- PWA 16-333 (Ni & Non Precip. Hard. Ni Alloys Welded To Precip. Hard. Ni Alloys)
- PWA 16-4 (Aluminum Alloys)
- PWA 16-6 (Commercial Pure Titanium)
- PWA 16-66 (Titanium Alloys)
- PWA 16-666 (Titanium Alloys, Special Alloy Filler Metal Requirement)
- PWA 16-7 (Cobalt ALLOYS)
- PWA 16-733 (Cobalt to Nickel Alloys)
Pratt & Whitney Approved Resistance Welding

Pratt & Whitney Canada
Lynn Welding is a Pratt & Whitney Canada Approved Welding Facility for Fusion Welding, Resistance Welding, and Tack Welding.
Pratt & Whitney Canada Approved Fusion Welding
- CPW 24-1A (Carbon and Low Alloy Steels)
- CPW 24-2AJ (Corrosion-resistance steels other than Precipitation Hardenable)
- CPW 24-22A (Precipitation Hardenable, Corrosion-resistance steels)
- CPW 24-3AJ (Nickel and Non-precipitation Hardenable Nickel Alloys)
- CPW 24-33AJ (Precipitation Hardenable Nickel Alloys)
- CPW 24-6AJ (Commercial Pure Titanium)
- CPW 24-66AJ (Titanium Alloys)
- CPW 24-7A (Cobalt Alloys)
Pratt & Whitney Canada Approved Resistance Welding

Northrop Grumman
Approved by Northrop Grumman for Fusion Welding & Resistance Welding. All Procedures are GTAW-MA (Gas Tungsten Arc Weld-Manual)
Northrop Grumman Approved Fusion Welding
Northrop Grumman Approved Resistance Welding

United Launch Alliance
United Launch Alliance welding certifications. All Procedures are GTAW-MA (Gas Tungsten Arc Weld-Manual)
United Launch Alliance Approved Fusion Welding
- AMS-STD-2219 (Fusion Welding (All Types))
- AC 7004 / AS 9003 (NADCAP Accreditation to AS 9003)
- AC7110/5 (Fusion Welding)
- AC7110/13 (Metal Evaluation of Welds)
- AC7110/12 (Operator Qualification)
- AC7110 (Welding/Brazing)
United Launch Alliance Approved Resistance Welding

Sikorsky
Lynn Welding holds a Sikorski-Approved Welding Certification for Fusion Welding, Brazing & Resistance Welding
Sikorsky Approved Fusion Welding
- AWS D17.1 (Specification For Fusion Welding For Aerospace Applications)
- MIL-STD-2219 (Military Standard: Fusion Welding For Aerospace Applications)
Sikorsky Approved Brazing
- SS8731 (Sikorsky Approved Brazing)
- MIL-B-7883 (Military Specification: Brazing Of Steels, Copper, Copper Alloys, Nickel Alloys, Aluminum And Aluminum Alloys)
Sikorsky Approved Resistance Welding

General Dynamics
Lynn Welding is approved by General Dynamics for Fusion Welding, Resistance Welding, Spot, Seam and Stitch
General Dynamics Approved Fusion Welding
General Dynamics Certified Resistance Spot Welding

Hawker Beechcraft
We are an approved Hawker Beechcraft welder and fabricator for Fusion Welding and Resistance Welding, Spot and Seam
Hawker Beechcraft Approved Fusion Welding
- 36B1 (Welding: Fusion - Aluminum Alloys)
- 36C1 (Welding: Fusion - Magnesium)
- 36D1 (Welding: Fusion- Steel Alloys)
- 36EA (Welding: Fusion-Titanium Alloys)
Hawker Beechcraft Approved Resistance Welding

Augusta Westland
Approved by Agusta Westland for Resistance Welding, Spot, Seam, Stitch as well as Fusion Welding processes.
Augusta Westland Approved Resistance Welding
Defense / Mil-Spec Welding Blog Articles
Nadcap and What it Means for Aircraft Quality
Jan 13, 2021
Keeping aircraft production at peak levels while continuing a track record for safety means the need for reliability and quality manufacturing. Aerospace vendors must produce safe and efficient airplanes while simultaneously seeking new technology and equipment to drive the industry forward.
Choosing an Aerospace Welding Company: Things To Consider
Jul 6, 2020
If you are in the market for an aerospace welding company, you should consider a few key items to make sure that you are selecting the best welder.
Lynn Welding is now approved for NAVSEA Welding!
Jun 24, 2020
With this approval, Lynn Welding will be able to weld parts for Naval applications. “This additional approval is an example of Lynn Welding’s commitment to further itself as the most robust and multi-certified welding company in the United States” stated Darius Kania, VP of Lynn Welding. Lynn Welding specializes in NADCAP approved defense welding and aerospace welding located in Connecticut.
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Exceeding Expectations!
“
I’d like to repeat what Anthony has passed along. We are very pleased with the results from your team at Lynn. We have several orders lined up with the NAVY and your help is key to their success. We appreciate your expeditious and quality service and look forward to much future work together.
Thanks again
”