wire-welding-mison-15.html
AGA CW Handbook A4_32130-UK
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16 the increased
welding
parameters and reduced co 2 content of the shielding
gas
es have increased the rate of deposition and welding speed, with the downside of increased ozone generation. the direction of development has for years been towards higher produc- tivity. in mig/mag welding, productivity has been improved by using higher welding parameters and reducing the co 2 /o 2 content in shield- ing gases. however, this has the downside of increased ozone genera- tion during welding. by using mison ® shielding gases, it is possible to improve productivity and reduce ozone generation at the same time. 4.3 shielding gas 4.3.1 ar/co 2 gas mixtures or co 2 ? carbon dioxide (co 2 ) used to be the most used shielding gas in mag welding, to a large extent due to its better availability and cheaper price compared to gas mixtures. overall, it is more crucial to examine what benefits a shielding gas can offer for productivity and quality, and what effect it will have on the amount of post-weld finishing work, than only consider this single cost factor. compared to the achievable cost savings, the price differences of different shielding gases are marginal. investing in the gas that produces the best results brings savings many times over in the total costs. by using gas mixtures, welding can be optimised for both productivity and quality. this has also been verified in practical welding work. the use of pure carbon dioxide as shielding gas is almost nonexistent nowadays. the chart below illustrates the change in total costs when moving from carbon dioxide to a gas mixture. it matches the practical results achieved over the years very well. in many cases, the savings have been even larger. the relative consumption of filler material per process in western europe 1975-1995 the growth of mig/mag welding has been sped up by the high deposition rate, lower overall costs, better work environment and suitability for mechanisation. 100 % 80 % 60 % 40 % 20 % 0 % 75 80 85 90 95 year the popularity of mig/mag welding thru the years submerged arc welding flux cored arc welding mma welding mig/mag welding 1960 1980 2000 2020 100 % 8 % year 1960 1980 2000 2020 400 a 200 a year average welding current average co 2 content the effect of shielding gas on productivity
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