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Category: Welding & Joining

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  1. Elevated and sub-zero temperature mechanical properties of stainless steels to BS EN 10269

    BS EN 10269 is the material standard for stainless and heat-resisting steels, a selection of low alloy steels and some nickel alloys for fasteners. The elevated and sub-zero temperature mechanical properties shown in this article include 0.2% proof, tensile and impact (charpy) strengths.

  2. EN 1090 - A Guide for Stainless Steel

    A guide to EN 1090 for stainless steel related issues

  3. Fabricating Duplex Stainless Steel

    Duplex Stainless Steels are growing at a high rate. It is important to understand how they differ from the more familiar stainless steels and how these differences affect the fabrication methods and parameters 

  4. Factors affecting wear and galling

    Galling, sometimes known as cold welding, is a form of severe adhesive wear which can occur when two metals are in relative motion and under sufficient load to permit the transfer of material. Severe galling can result in seizure of metal components. The key factors affecting the tendancy for galling are design tolerances and the surface finish, hardness and microstrucure of the metals in contact.

  5. Fume associated with welding and cutting stainless steels

    Both flux- and gas-shielded processes for welding stainless steels generate fume. So does plasma arc cutting. Fume consists of both particles and gases, including ozone. Concerns that fume, particularly particles containing hexavalent chromium, is a cause of cancer have not been supported by extensive studies, although there is a slight excess of lung cancers among all welders. Therefore it is sensible to limit contact with welding fume and there are statutory requirements.

  6. Galling resistance of stainless steels

    Galling, sometimes known as cold welding, is a form of severe adhesive wear which can occur when two metals are in relative motion and under sufficient load to permit the transfer of material. Austenitic and precititation hardening stainless steels have poor resistance to galling. Hardenable martensitic stainless steels have better galling resistance. The galling characteristics of duplex stainless steels is thought to be similar to that of austenitic stainless steels.

  7. Gas Tungsten Arc Welding Electrodes for Stainless Steels

    This technical paper by Dr Mike Fletcher, Metallurgical and Welding Consultant to Huntingdon Fusion Techniques Ltd, explores the development in the composition of electrodes used in the GTAW (TIG) process. He concludes that refractory oxide doping is beneficial, in particular lanthana and ceria.

  8. Getting the Best out of Stainless Steel

    Stainless steel is a great material to work with. As with all materials you need to know how to treat it correctly for maximum cost effectiveness. This article summarises the typical pitfalls and remedies.

  9. Heat tint (temper) colours on stainless steel surfaces heated in air

    A colour chart is shown for guidance on exposure temperatures on 1.4301 (304) type. The factors affecting the degree or depth of colours formed are outlined. These include steel composition, atmosphere, time and surface finish.

  10. Improving wear and galling resistance of stainless steels

    Galling, sometimes known as cold welding, is a form of severe adhesive wear which can occur when two metals are in relative motion and under sufficient load to permit the transfer of material. Lubrication in improves galling resistance. A solid lubrication system such as a PTFE coating gives better galling resistance than greases. Altering the surface characteristics by nitriding or chromium plating also improves wear and galling resistance.

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