Re: final score--plow 1 truck 0


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Posted by Jason [70.56.110.252] on Sunday, February 21, 2010 at 10:54:17 :

In Reply to: Re: final score--plow 1 truck 0 posted by bill in pa [75.198.191.49] on Sunday, February 21, 2010 at 08:07:01 :

how hot are you running it? it's the CO2 in the mix that'll give you hell on stuff like that. tends to make a more brittle weld.i'd try running straight Argon. Read this article snippet, pretty interesting.

The effect of welding on various materials depends upon many of their metallurgical properties (Table 1) such as "hot strength." After the applied energy is removed, the melt pool solidifies and then it slowly cools to the same temperature as the surrounding material. During this cooling, the material contracts, creating tensile stresses in the fusion zone. Materials that have a low tensile strength at temperatures near their melting point are said to exhibit "hot shortness," which often results in cracks appearing in the weld.

Similarly, other thermal transformation, such as the martensitic transformation of high carbon steel, also can lead to cracking in or near the weld. To overcome this tendency, special precautions such as pre- and post-welding heating of the material is necessary.



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