# US 2014/0153693 A1 · Inspection method for welded joint > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153693 A1 - Document ID: US20140153693A1 - Status: Published application - Kind: A1 - Application number: 13/837,487 - Filed: 2013-03-15 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Mitsubishi Heavy Industries, Ltd. - Applicants: Mitsubishi Heavy Industries, Ltd. - Inventors: Shin NISHIMOTO; Makoto TANAKA; Kenji KAWASAKI; Hiroyuki ENDO; Kentaro UCHIYAMA; Yoshinobu KOORI - Web page: https://patentgrep.com/patent/US20140153693A1 ## CPC - G01N 23/04: and forming images of the material - F01D 21/003: {Arrangements for testing or measuring (for measuring vibrations G01H)} - F01D 5/063: {Welded rotors (welding per se B23K)} - F05D 2230/232: by welding - F05D 2260/80: Diagnostics - F05D 2300/171: Steel alloys - G01N 2223/629: welds, bonds, sealing compounds - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract An inspection method for a welded joint formed between a pair of base metals 10, 20 with a groove part 12, 22 and an abutment face 14, 24 being formed on a joint surface Wc between the pair of base metals 10, 20, includes steps of: forming a recessed groove 32 opening to a surface of the base metal 10, 20 in advance at one end of the abutment face; irradiating the joint surface Wc from an X-ray generator 34 placed on a groove part formation side (an exterior space O side) toward the joint surface Wc after at least one pass P1 of build-up welding is performed on the groove parts 12, 22; and determining presence or absence of incomplete penetration in the welded joint part W based on an image formed on a photosensitive film 42 by radiation penetrating the joint surface Wc. ## Claims ### Claim 1 An inspection method for a welded joint formed between a pair of base metals with a groove part and an abutment face being formed on a joint surface between the pair of base metals, the method comprising the steps of: forming a recessed groove opening to a surface of the base metal in advance at one end of the abutment face; irradiating the joint surface from a groove part formation side after at least one pass of build-up welding is performed on the groove part; and determining presence or absence of incomplete penetration in the welded joint based on an image formed on a photosensitive film by radiation penetrating the joint surface. ### Claim 2 (depends on 1) The inspection method for the welded joint according to claim 1, wherein the recessed groove has a cross section area whose dimension has a lower limit so that the recessed groove is distinguishable using the image obtained in the determining step and an upper limit so that the recessed groove is fillable with the at least one pass of build-up welding. ### Claim 3 (depends on 1) The inspection method for the welded joint according to claim 1, wherein the recessed groove is formed on the joint surface of only one of the pair of base metals. ### Claim 4 (depends on 1) The inspection method for the welded joint according to claim 1, wherein on the joint surface, a protrusion and a recess are formed adjacent to the recessed groove, the protrusion and the recess being configured to complementarily fit to each other. ### Claim 5 (depends on 1) The inspection method for the welded joint according to claim 1, wherein the pair of base metals has a hollow cylindrical shape and is welded to each other in an axial direction via the joint surfaces. ### Claim 6 (depends on 5) The inspection method for the welded joint according to claim 5, wherein the pair of base metals is adjacent two of hollow cylindrical bodies of a welded rotor for a turbine which is formed by the hollow cylindrical bodies welded to one another in the axial direction via the joint surfaces. ### Claim 7 (depends on 2) The inspection method for the welded joint according to claim 2, wherein the recessed groove is formed on the joint surface of only one of the pair of base metals. ### Claim 8 (depends on 2) The inspection method for the welded joint according to claim 2, wherein on the joint surface, a protrusion and a recess are formed adjacent to the recessed groove, the protrusion and the recess being configured to complementarily fit to each other. ### Claim 9 (depends on 2) The inspection method for the welded joint according to claim 2, wherein the pair of base metals has a hollow cylindrical shape and is welded to each other in an axial direction via the joint surfaces. ### Claim 10 (depends on 9) The inspection method for the welded joint according to claim 9, wherein the pair of base metals is adjacent two of hollow cylindrical bodies of a welded rotor for a turbine which is formed by the hollow cylindrical bodies welded to one another in the axial direction via the joint surfaces.