Welding Process and Welding Quality Inspection of Titanium Alloy

In order to avoid common welding defects and at the same time ensure the mechanical properties and corrosion resistance of the weld, when welding titanium and its alloys, a reasonable titanium alloy processing technology must be formulated to ensure the welding quality. At present, the commonly used processes for welding titanium and titanium alloys include argon tungsten arc welding, melting electrode argon arc welding, plasma arc welding, electron beam welding, laser beam welding, brazing, etc.

titanium welding filler wire is a commonly used welding method for welding titanium alloys, mainly used for the welding of titanium and titanium alloys with a thickness of less than 10mm. Manual tungsten argon arc welding has wide adaptability and reliable welding quality, but it has low welding efficiency and high labor intensity for thick plate welding. Melting electrode argon arc welding is more efficient than tungsten electrode argon arc welding and is mainly used for welding thick plates, but the welding process requires higher process parameters and a welding environment, otherwise, it is easy to generate pores. The thickness range of plasma arc welding is relatively wide, and it can be used from thin plates to thick plates, but attention should be paid to the damage to the nozzle during welding. Vacuum electron beam welding is also increasingly used for titanium welding. Because it is in a vacuum environment, it can obtain high-quality welded joints, but at the same time, because it needs to be welded in a vacuum chamber, the size of the workpiece is limited. Compared with the electron beam and plasma beam welding, laser welding has a molten pool purification effect, which can purify the weld metal, and the mechanical properties of the weld are equal to or better than those of the base metal. Brazing can also be used for some micro and precise parts.

Weld quality inspection:

The inspection standards and the specific welding seam inspection standards are strictly implemented in accordance with the drawing requirements and contract requirements.

inspection method:

Appearance inspection and inspection of the surface color of titanium welded joints are the primary control points for the inspection of welded joints. The surface of the welded joint is silver-white and golden-yellow as qualified. Blue, purple, gray and other colors are unqualified, and the surface needs to be treated or repaired.

The appearance quality of welds:

First of all, there should be no welding deformation. The workpiece will generally deform after welding. If the deformation exceeds the allowable value, it will affect the use. Furthermore, it is necessary to control the amount of misalignment and the excess height of the weld, which cannot exceed the tolerance range of the relevant standards. The surface of titanium alloy welds should be free of slag, spatter, cracks, weld bead, incomplete penetration, undercut, excess convex surface (fillet weld), poor forming, misalignment, burn through, arc damage, collapse, porosity, slag inclusion Such defects are visible to the naked eye.