Poor welding of energy storage welding machine
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6 FAQs about [Poor welding of energy storage welding machine]
How does welding energy affect electrical contact resistance and tensile force?
Further increasing the welding energy leads to electrode sticking and significant expulsion of bulk material , , , . Fig. 6. Electrical contact resistance and ultimate tensile force as function of welding energy.
What is resistance spot welding?
Resistance spot, ultrasonic or laser beam welding are mostly used for connecting battery cells in the production of large battery assemblies. Each of these welding techniques has its own characteristics depending on the material properties and contact geometry. Cell casing and terminal dimensions may constrain possible contact geometries.
Do voids inside the weld Nuggets reduce the strength of a joint?
The voids inside the weld nuggets for spot-welded CuZn37 test samples reduce the strength of the joint. But for spot-welded Hilumin test samples the base material failed and not the weld spots themselves (see Fig. 6). This was only observed with resistance spot welding.
How can a quality feature of a weld be correlated?
Their common point is that they are practically investigating how the process emissions, the input parameters, or/and the variables can be correlated to a quality feature of the weld mainly using empirical or data-driven approaches [18, 19].
Is there a quality assurance approach for laser welding?
Of course, if someone looks beyond the battery welding applications many in-process quality assurance approaches are available for welding . In the case of laser welding, the in- process monitoring is mainly based on imaging, acoustic emission, and E/M signal techniques in general .
Why is spot welding of cuzn37 difficult?
As already discussed in Section 3, spot welding of CuZn37 generates voids inside the weld nugget and, therefore, higher electrical contact resistances as well as lowest ultimate tensile forces were measured. A possible stray current might pose another difficulty for further weld spots, when some weld spots are already made in close vicinity.