• Save
Reducing Helium Use for GMAW on Nickel Based Alloys - QuickView
Upcoming SlideShare
Loading in...5

Reducing Helium Use for GMAW on Nickel Based Alloys - QuickView






Total Views
Views on SlideShare
Embed Views



2 Embeds 2

http://a0.twimg.com 1
https://twimg0-a.akamaihd.net 1



Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
Post Comment
Edit your comment

Reducing Helium Use for GMAW on Nickel Based Alloys - QuickView Reducing Helium Use for GMAW on Nickel Based Alloys - QuickView Presentation Transcript

  • QuickViewQuickView Reducing the use of Helium in GMAW Applications on Nickel-Based Alloys Improve Productivity & Quality; Reduce Total Cost MATHESON QuickView Application Review and Summary
  • QuickViewQuickView Helium Supply Update • Helium is a non-renewable resource • Helium supply is subject to variability – Helium prices fluctuate … and the future is unpredictable • For welding applications, alternatives to helium exist – Many of the alternatives offer advantages Now is the time to consider shielding gas alternatives that use less - or zero - helium.
  • QuickViewQuickView Why use Helium? • Helium creates a high energy arc – High ionization potential (24.5874 eV) – Produces hotter arc (at higher voltages) • Produces a shallower, wider bead profile – Effect is proportional to Helium concentration • High heat can be advantageous on thicker sections • Helium can be useful on aluminum, magnesium, copper alloys • Helium when blended with Argon, CO2, and other gases, creates a mixture with blended characteristics Frequently Specified Application: Mixtures rich in Helium – typically 90% - for Stainless Steel View slide
  • QuickViewQuickView Helium’s Disadvantages • Helium’s high ionization potential leads to: – Less stable arc – can lead to inconsistent results Disadvantages are proportional – Hotter arc – can lead to distortion & warping to Helium concentration • Helium can lead to penetration issues • Helium can increase spatter • Helium is a light atom and a less effective shield – Helium flow rate per unit of deposited metal is higher than other gases • Helium is subject to supply and price variability – The cost of Helium must be considered in high production applications Using more He is not the only choice; and is often not the best choice. View slide
  • QuickViewQuickView GOAL: Reduce or Eliminate Helium Use • Alternatives to Helium exist • Helium use can be reduced Consider mixtures or eliminated optimized for the • With excellent results: process and – Better weld penetration application. – Significant reduction in porosity – Increased travel speed – Improved arc stability; less spatter and smoke – Improved puddle and flow control (smaller droplet) – Reduced Heat Affected Zone (HAZ) – Less heat-related damage to base material – Reduced burn-through on thin materials – More flexibility to use other processes (spray and pulsed spray, in addition to short circuit)
  • QuickViewQuickView GMAW on Nickel-Based Alloys
  • QuickViewQuickView Nickel-Based Alloys GMAW • Outdated: 90%He / 7.5%Ar / 2.5%CO2 – Expensive for GMAW of stainless steel and other alloys due to high concentration of Helium – Narrow voltage range (18V-22V) – Limited to Short Circuit Transfer – High heat (due to high ionization potential of He) is detrimental to mechanical properties of base material – Distortion, poor color match, warpage, suck-back, poor productivity
  • QuickViewQuickView Nickel-Based Alloys GMAW • Different conventional setups for stainless steels – For Short Circuit: 90%He / 7.5%Ar / 2.5%CO2 – For Normal or Pulsed Spray: 98%Ar / 2%O2 • Well known fact: – Neither of the above shielding gas mixtures is optimized for both short circuit and spray • For Stainless Steels, you must have two setups with traditional gas mixture compositions – one for short circuit and one for spray
  • QuickViewQuickView Nickel-Based Alloys GMAW • 90%He / 7.5%Ar / 2.5%CO2 – Works well for Short Circuit • Here’s why you can’t use it for Spray Arc: 90%He / 7.5%Ar / 2.5%CO2 If used for Spray Arc: • Very unstable arc • Large droplet formation • Explosive transfer
  • QuickViewQuickView Nickel-Based Alloys GMAW • MATHESON Select® HC-725 (and HC-332) – Use up to 90% less Helium; uses more Argon instead – Expanded Voltage Range (14.5V-38V) • Use of lower voltages results in less heat input – Lower operating temperature Stainless Steel • Inconel® Reduced heat on lighter materials Hastelloy® • Reduced burn through, suck-back Monel® • Reduced HAZ • Reduced hexavalent chromium emission – Higher productivity and lower total welding cost – One mix ideal for short circuit, spray, and pulsed spray
  • QuickViewQuickView Nickel-Based Alloys GMAW • MATHESON Select® HC-725 – One mix ideal for short circuit, spray, and pulsed spray – One setup is appropriate for all processes • Here’s a look at MATHESON Select® HC-725 for Spray Arc: HC-725 with Spray Arc: • Stable plasma • Small droplet formation • Smooth transfer
  • QuickViewQuickView Nickel-Based Alloys GMAW • In some applications: – Users may be able to switch from Short Circuit to Spray Arc – Spray Arc is faster – reducing not only time, but cost • Some studies show total cost cut in half! – Users who use MATHESON Select® HC-725 Shielding Gas • Can use Spray or Pulsed Spray for higher speed, cost savings, and better results • Can switch back to Short Circuit as needed
  • QuickViewQuickView In Review … • Forward thinking leads to better solutions Thank you • Use of less Helium can: for your – Produce better results time! – Improve cost per weld – Enable the use of ONE SETUP for all applications on SS • Easily applied in GMAW and GTAW on Nickel-Based alloys • We are here to support you • Learn more: contact your MATHESON rep or visit one of our stores • Find us fast at: www.MathesonGas.com/contactus.aspx