Laser welding machines prevent incomplete penetration and incomplete fusion.

Laser welding machines, as a leading welding technology, have found increasingly widespread application across various industries. Leveraging their unique advantages and high-quality welds, they have propelled rapid development in industrial sectors. However, laser welding technology can also experience issues such as burn-through. The primary causes of burn-through and crater formation include excessive welding current, insufficient welding speed, or excessive groove gap. During gas shielded arc welding, excessive gas flow rate may also lead to burn-through.

To prevent burn-through and cratering, welding current and welding speed must be appropriately coordinated. For instance, when using higher welding currents, welding speed should be increased accordingly, and the installation gap of the workpiece must be strictly controlled. During gas shielded welding, attention should also be paid to avoiding excessive gas flow rates to prevent cutting effects.

Generally, flat welding yields good weld bead formation. Achieving satisfactory bead formation with laser welding machines is more challenging for single-sided double-sided bead formation, curved welds, vertical and horizontal welds, and all-position welding. Appropriate measures must typically be adopted based on specific conditions to achieve the desired results.

In laser welding, incomplete penetration at the root of the weld joint is termed “lack of penetration.” Incomplete fusion, where the weld bead fails to fully bond with the base metal or between weld beads, is termed “lack of fusion.” These defects create stress concentrations, reducing the joint's mechanical properties. The primary causes of lack of fusion and lack of penetration include insufficient welding current, excessive welding speed, improper groove dimensions, and wire deviation from the weld centerline or magnetic blow effects. Poor workpiece cleaning, where impurities prevent fusion between the base metal edges and root or between weld layers, can also lead to these defects.

To prevent lack of fusion and incomplete fusion in laser welding machines, precise selection of welding parameters, groove configuration, and installation clearance is essential, ensuring the welding beam aligns with the weld centerline. Simultaneously, meticulous cleaning of both sides of the groove and between weld passes is required to achieve thorough fusion between molten metals and between deposited metal and base metal.

For more information about laser marking machines, laser welding machines, and laser cutting machines, please visit the official website of Wuxi Top Optics Laser Technology Co., Ltd.: http://www.tollaser.com