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Automatic Pneumatic Weld Seam Strength Tester for Bandsaw Blades. WTM-80 Bandsaw Blade Weld Joint Testing Machine is a pneumatic testing device used to evaluate the strength and quality of welded joints. This equipment uses a cylinder-driven front test block to apply forward pressure on the bandsaw blade, exerting a stable force on the weld area to determine whether defects such as cracking, debonding. This weld joint strength testing machine is equipped with multiple interchangeable test blocks in various specifications.