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In aluminum, this problem can easily be solved by using a back stepping technique or utilizing crater fill options in advanced power sources. They also create solidification cracks which greatly diminish the fatigue life of the weldment.Ĭraters at weld terminations are very common in aluminum. Craters reduce the cross sectional area of the weld and create stress risers.
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Weld assistant 6 crack full#
Not filling craters – weld terminations where the full cross section of the weld is not achieved can be problematic and lead to cracking, especially when welding aluminum.
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Using low-hydrogen practice will help you prevent hydrogen induced cracking. Do not make mistakes that will lead to hydrogen induced cracking.
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We hardly ever have control over the first two, but we can certainly control the third. There are three things that need to be present for hydrogen induced cracking to occur: First, a susceptible microstructure. Ignoring low-hydrogen practice when required – if you read our articles often you know we constantly talk about hydrogen induced cracking.There is a reduction of about 50% in the load carrying capacity of this weld due to its extreme concavity. The weld’s concavity creates a reduction in the throat dimension represented b y the green line. The red line represents the desired dimension of the weld throat. Leaving crack-like discontinuities that can easily reach the surface of the weld. These low melting temperature elements are driven to the middle of the weld and solidify last. If steels have a significant amount of tramp elements, specifically those with low melting temperatures like copper, you run the risk of solidification cracking. Solidification begins from the outer edges and progresses towards the middle. A weld nugget will go from molten metal to solidified metal in the same way that water turns into ice in a glass left in the freezer. Excessive width-to-depth ratio – welds should have a width-to-depth ratio of about one to one.You can always add strength to the connection by making the weld bigger, but ductility will remain the same. If you are making partial joint penetration welds (PJPs) or fillet welds on high strength steels consider using undermatching filler metals when permitted. Lower residual stresses are also a benefit of using undermatching filler metals. Why? Because the lower strength will provide a more ductile weld compared to using a matching filler metal. When we are dealing with high strength steels the use of undermatching filler metals may be advantageous. But in some cases, matching the strength of the base metal with the filler metal may lead to cracking. In the case of complete joint penetration welds (CJPs) it is necessary. In the vast majority of cases using matching filler metals presents absolutely no problems. Using a matching filler metal – there is a misconception that because codes list matching filler metals (to base metals) that we must use these.So naturally we want to avoid cracks at all costs.īelow is a list of 6 mistakes you need to avoid in order to reduce cracking susceptibility.
Weld assistant 6 crack crack#
Being a linear discontinuity, a crack will tend to propagate through the weld and into the base metal with relative ease, especially in cyclically loaded structures. However, there is never an allowance for cracks. Welding codes always have allowances for porosity, undercut, weld sizes, and even weld profiles.