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The department has an extensive catalogue of welding procedures qualified to National and International standards including BS EN, AWS and ASME, using a wide range of welding processes and materials from 3mm thick to more than 250mm thick. All welders are coded to BSEN287 for welding carbon and alloy steels, stainless steel and nickel alloys.

Special techniques have been developed using both conventional welding methods and the latest Technologies to improve quality and productivity. The welding techniques in regular use are: MIG and MAG; Flux Cored Arc; Submerged Arc; TIG; Stick; Pulse Arc and STT; and Strip Cladding.

Heavy fabrications' utilize several overhead cranes, up to a maximum of 275 Tonnes. Where heavier pieces require welding, the work is carried out in the machine or assembly bays where craneage reaches 350 Tonnes.

The Fabrication Shop equipment includes: 2 x CNC profile burning machines; 1 x heavy plate ‘Bronx Roll’ bending machine; 1 x 500T Hydraulic Press; 1 x 50T Side Press; Large saw, guillotine and portable drillers; 40 x various welding machines; Various welding Positioners and Rotators up to 50T; Gas and electric preheating equipment; and Two large modern Heat Treatment ovens 60m³ and 150m³ are used for post weld stress relief at temperatures up to 900°C.

Surface Treatment of fabrications and machined components comprising of Shot blasting and Painting. This is carried out in a dedicated adjacent shop connected by rail lines and contains the following equipment: 1 x 60T overhead crane 1 x 50m3 shotblasting room plus portable units for larger pieces 1 x 750m3 painting room with manual airless spray pumps A wide range of painting systems are in regular use according to customer requirements. Special coating systems such as metal-spraying and electroplating are contracted-in as required.

The experience of the Fabrication Team with heavy precision fabrications is formidable and unique within Europe. The majority of the team have worked together for more than 25 years and their successes include work for the following industries: Hydro, Nuclear and Power Generation; Mining, Tunnelling and Winding equipment; Capital Plant for the Metal Producing Industries; Bridge Construction and Structural Engineering; Components for Shipbuilding and offshore industries; and Aero Engine testing equipment.

Typical projects DavyMarkham has been involved with include:   Vertical Cable Laying-Up Machine - London - England Selby Swing Bridge - Selby - England Wellington Street Bridge - Kingston-upon-Hull - England Electron Beam Welding Vacuum Chamber - Cambridge - England Tsing Ma, Lantau Bridge - Hong Kong Helix Bridge - London - England Stainless Steel Knife Gates Valves- Changi - Singapore Nuclear Shield Doors - Sellafield - England Interaction Chamber - Didcot - England High Orchard Lift Bridge - Gloucester - England Heathrow Airport Control Tower - London - England Heathrow Airport Terminal 5 - London - England Great Wharf Road Tilting Bridge - London - England Gateshead Millennium Bridge - Newcastle upon Tyne - England Flask Transporter - Sellafield - England Drum Gate Refurbishment - Various Sites - Scotland Main Tailgate Lifting Equipment - Dinorwig - Wales Butterfly Valve - e-Tec - England Bellmouth Swing Bridges - London - England Roll on Roll off Bridge - Train ferry berth - Dover - England 6000t Forging Press - Dunkerque - France 200t & 1000t Conductor Turntables - London - England 35,500t Screw Press - Kapfenberg - Austria 10m Cutterhead - Nagarjunasager - India Heron Tower - London - England Nickel Rim Mine - Sudbury - Canada Laronde Mine - Sudbury - Canada Creighton Mine - Sudbury - Canada Coleman Mine - Sudbury - Canada Totten Mine - Sudbury - Canada Steam Chest - Cottam Power Station - England Draft Tube Liner - Foyers Power Station - Scotland Turret shaft cladding and fabrication - South China Sea Westwood Project - Québec - Canada Éléonore Mine - Québec - Canada

Click the links above to view the relevant Project Datasheet as an Adobe Acrobat PDF file.