A kind of electron beam welding method of dense rectangular girth weld on outer annular surface

Abstract

The invention relates to an electron beam welding method for dense rectangular ring welding lines of an outer ring face. According to the electron beam welding method for the dense rectangular ring welding lines of the outer ring face, a thickness-unequal butt joint form increasing the local thickness of the welding part head portion is designed, and a beam flow guiding welding along long edges and lap-joint and step-attenuating beam flow closing welding method is adopted, so that the amount of molten metal is increased, the welding line molding quality is improved, and the process stability and margin are improved; misplaced and lapped U-shaped protective structures are designed inside an outer ring, and injuries by burning on a shaft rod and an inner ring structure are avoided; and a symmetrical welding method is adopted, the welding sequence is designed, a grouped multiple welding manner is adopted, the accumulation effect of dense welding-line welding heat input and stress deformation is reduced, influence of the dense welding-line stress deformation on welding gaps, order difference and the like is reduced, the welding quantity is improved, control of welding deformation and structural size accuracy is facilitated, and the welding finished product rate is increased.

Description

technical field [0001] The invention relates to an electron beam welding method for a dense rectangular ring weld on an outer ring surface, and belongs to the technical field of electron beam welding. Background technique [0002] In engineering practice, casing parts usually contain component structures such as outer rings, inner rings, and support plates. The diameter of the outer ring is generally above 800mm, and dense square holes are usually designed on the outer ring surface, with a size width of 30-90mm, a length of 30-90mm, and a fillet radius of 5-12mm; insert the support plate head into the square hole, and weld through the square ring seam Connect the dense struts to the outer ring. Since the outer ring surface and the head of the support plate are thin-walled (≤3mm), the diameter is large and the rigidity is poor; generally there are many support plate structures (more than 10 pieces), and the outer ring surface contains dense square ring seams; The circular s...

AI Technical Summary

Problems solved by technology

[0004] 1) Since the welding wall thickness of a single weld is thin and there is no additional filler metal, the weld is likely to cause defects such as pits and weld collapse; it is also prone to defects in the fillet parts where the welding trajectory changes drastically and the lead / receive overlap parts Welding defects such as welding collapse and melting cutting

[0005] 2) Due to the large number of dense welds, the accumulated and superimposed welding shrinkage deformation is relatively large, which will easily cause the inner diameter of the outer ring to become smaller and the flow channel space to be reduced

In addition, due to the accumulated welding shrinkage deformation, the butt gap of the local square circular weld will increase, which will easily cause defects such as weld collapse, melting cutting and poor surface forming.

[0006] 3) The welding stress of the dense weld seam is also continuously accumulated and superimposed, resulting in easy cracks on the support plate and its head

[0007] The welding problems caused by the above casing parts are mainly because the process stability of a single weld, the welding sequence of dense welds, and the symmetrical input of welding heat sources have not been fully considered during the welding process.

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