Radleigh-Nash’s electric stress relieving oven has the capacity to cope with heavy steel fabrications and large plates alike.

Its large size means we can fit fabrications or plates up to 6.2 metres long by 2.6 metres wide & 1.8 metre high with a maximum weight of 20 tonnes. Being a 3 zone electrically fired thermal stress relieving oven allows us much greater temperature control over the post weld heat treatment process than gas fired or other furnace types, especially in the climb and cool down phases of the process. The electric type of thermal stress relieving oven also produces less scale on the fabrications due to there being significantly less oxygen present during the firing. Our standard soak temperature is 600°C but can be adjusted for individual customer specifications as well as the climb and cool down ramps.

We normally fire 5 nights a week & most weekends, which can accommodate longer soak time items or be set to customer specific temperatures. Our oven is fully calibrated in all 3 zones & for each 'furnace batch' we can supply a calibrated heat cycle chart to ensure soak times and temperatures have been achieved & to ensure that steel and welds have been adequately stress relieved.

Post Weld Stress Relieved Machined Fabrication

Thermal stress relief is normally carried out as a post weld heat treatment to release any build of stresses caused by the welding process. As the rapid input of heat and subsequent rapid cooling can cause tension to form in the material as well as hardening and changes to the crystalline structure while most of the changes metallurgical changes take place in the weld fusion zone and the heat affected zone (HAZ) the subsequent tension in the base material can affect the whole of the fabrication. This will often become apparent during machining, where a fabrication loss of the surface and reduction in material thickness can cause the item to “spring” or distort and result in a loss of tolerance.

Welding isn’t the only process to cause a buildup of stresses, the manufacture of steels leaves behind residual stresses as well as any cutting, burning, bending and other plastic deformation processes. Sometimes minor stresses are enough to effect high precision machined parts and may require multiple stress relieving operations throughout the machining process.

Thermal Stress Relief Service

Facilities List

Electrically fired Stress Relief Furnace

  • Maximum Job Size: 6.2M by 2.6M by 1.9M high
  • Max Weight: 15 tonne

Shot Blasting Cabinets

  • Chilled Iron Grit Blast Room Dimensions:
  • 13M in length x 6M wide x 6M high
  • Max Weight: 16 tonne
  • Chilled Iron Grit Blast Room Dimensions:
  • 7.8M in length x 4.3M wide x 5.9M high
  • Max Weight: 16 tonne
  • Aluminium Oxide Blast Room Dimensions:
  • 7M in length x 3M wide x 3M high
  • Max Weight: 8 tonne

Wet Spray Booths

  • Wet spray filtered extraction booths.
  • 2 OFF 6M in length extraction booths
  • 2 OFF 3M in length extraction booths

Large Wet Spray Tack System

  • 80 hangers on the track
  • 450 KG per hanger
  • 6M max job length
  • Wet back extraction paint room
  • up to 90°c on track baking oven

Small Wet Spray Tack System

  • 40 hanger track
  • 30 KG per hanger
  • Dry back extraction paint room

Thermal Spraying

  • Thermal Spraying filtered extraction booths.
  • 1 OFF 3M in length extraction booth

Quality

Inspection

Quality

Inspection

Qualified NACE Inspector (Certified member of the National Association of Corrosion Engineers)
Radleigh-Nash can carry out the following tests to suit your requirements including:
  • Various test methods with calibrated digital and/or analogy equipment
  • Bresle patch test using a digital conductivity meter
  • Soluble Salt Test for contamination of steel surfaces from soluble salts
  • DTF's using a calibrated digital coating thickness gauge
  • Coating Thickness on Ferrous & Non-Ferrous Substrates
  • WTF's using wet film combs to obtain correct DFT
  • Blast profile testing using peak-to-valley tape and calibrated thickness gauge
  • Pull-off Dolly tests using a calibrated hydraulic pull-off adhesion tester
  • Destructive adhesion tests using cross hatch cutter and tape
  • M.E.K. Rub Test for cure of primers and final coats
  • Holiday Test to check for pinholes and voids
  • Amine Blush Check
  • RAL / BS Colour matching
  • Coating Procedures according to ISO 12944 and NORSOK M501 Standards
  • Custom Coating Systems to client specification

Workshop Facilities

Heavy Paint Shop

Work Area:
1870 square metres (20100 sq. ft.)
Lifting capacity:
Maximum lift 16 tonnes
Maximum job height 5 metres
Door Access:
6M wide X 4.5M high

Medium Paint Shop

Work Area:
1350 square metres (14500 sq. ft.)
Lifting capacity:
Maximum lift 8 tonnes
Maximum job height 5 metres

Light Paint Shop

Work Area:
600 square metres (6400 sq. ft.)
Lifting capacity:
Maximum lift 2 tonnes
Maximum job height 5 metres

Storage yards

Outside Area:
Lifting capacity:
Maximum lift 2 tonnes
1858 square metres (20000 sq. ft.)