[MW:14672] Fw: A hybrid laser-arc weld webinar by The Welding Institute (UK)

From: Mr J C Shahani, TWI Consultant in India

Subject: Your invite to a FREE hybrid laser-arc weld webinar. (Note: IST is 4hours 30minutes ahead of BST.)

PLEASE CONTACT Mr SHAHANI BY E-MAIL / Phone: (0)94338 93925.

Hybrid laser-arc welding - an opportunity to attend a free webinar

3 July 2012
9:00 – 10:00 and 4:00 – 5:00pm BST

Hybrid laser-arc welding technology is used in industry worldwide for road transport, shipbuilding, rail transport and oil & gas applications. The technology is not standing still. This webinar will look at recent developments in laser hybrid arc welding and application of the technology.

The webinar will take place 9:00am BST but will be repeated at 4:00pm BST. Please book the time that is most suitable for you:

Register for the 9am webinar

Register for the 4pm webinar

Background information

Hybrid laser-arc welding is a joining process whereby arc welding and deep penetration laser welding are carried out simultaneously in the same process. In theory, the beam from any laser source (CO2, Nd:YAG, diode, Yb fibre, Yb:YAG disk etc) can be combined with any arc welding process (MIG/MAG, TIG, SAW, plasma), although hybrid laser-MIG/MAG and laser-TIG are perhaps the most common combinations. As a consequence of this, the process has the individual advantages of both laser and arc welding combined.

Deep penetration welds comparable with laser welds can be made, at the same time having a tolerance to joint fit-up more comparable with arc welds. Furthermore, arc welding consumables can be used, giving a degree of control over weld quality and properties greater than that possible with autogenous laser welds.

TWI has over a decade of experience of hybrid laser-arc welding processes and their development. This includes experience of combining a variety of industrial lasers used for metals welding (principally CO2, Nd:YAG and, most recently, Yb fibre lasers) with MIG/MAG and TIG arc welding.

Furthermore, TWI's research and development in this area has covered a broad base of engineering alloys, including C-Mn steels used for structural and pipeline applications, conventional (austenitic) and higher strength (duplex and ferritic) stainless steels, as well as a wide range of aluminium alloys.

The chief benefits of hybrid laser-arc welding can be summarised as:

• Improved tolerance to joint fit-up: for example, hybrid welding can extend the tolerance to joint gap by a factor of 2-3 over laser welding.
• Improved weld quality: hot cracking (e.g. in some higher strength Al alloys) can be avoided, and internal porosity content reduced, with respect to laser welds.

About Us	Professional Membership	Welding & Joining Society

Fab Futures	News and Events	Contact Us

Update Profile / Unsubscribe

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

Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...

Materails FAQs

Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...

The Schaeffler and Delong diagrams for predicting ferrite levels in austenitic stainless steel welds

Introduction Ferrite is important in avoiding hot cracking in during cooling from welding of austenitic stainless steels. 'Constitution diagrams' are used to predict ferrite levels from the composition by comparing the effects of austenite and ferrite stabilising elements. The Schaeffler and Delong diagrams are the original methods of predicting the phase balances in austenitic stainless steel welds. Nickel and chromium equivalents A 'nickel equivalent' is calculated for the austenite stabilising elements and a 'chromium equivalent' ferrite stabilising elements. These are used as the axes for the diagrams, which show the compositional equivalent areas where the phases austenite, ferrite, martensite (and mixtures of these) should be present. Although intended to show the phase balance of weld fillers, these diagrams can also be used to illustrate the phase balance of the 'parent' material. There are different diagrams for dif...

Materials & Welding

Search This Blog