5.3　Welding

5.3.1　Acceptance of the key items of welding shall comply with the following requirements:

1　The welder shall be trained or pass relevant examination and get the certification，and conduct welding on items being qualified through examination and within the approved scope.

Sample size:100%.

Check method:Checking the welder's certification and its valid period.

2　For T-joint，cross joint，angle joint and so on of which the full penetrated butt joint and angle butt joint combined welding seam is required，the fillet weld size and allowable deviation shall comply with the requirements in current national standard GB 50205 Code for Acceptance of Construction Quality of Steel Structures.

5.3.2　Acceptance of ordinary items of welding shall comply with the following requirements:

1　Grade 2 and 3 not fully filled weld，root shrinkage，undercut and other appearance quality items shall meet the requirements in Table A.0.1 of Appendix A of current national standard GB 50205-2001 Code for Acceptance of Construction Quality of Steel Structures.

Sample size:10% and at least 3 pieces for each batch of components of the same type；5% and at least 1 welding seam pass for each type of the welding seam of the sampled components，；1 spot oneach welding seampass，and at least 5 places in total.

Check method:Visual inspection or measuring with magnifier，weld gauge and steel ruler.

2　The weld reinforcement，unfitness of butt weld and other allowable dimension deviations shall comply with the requirements in Table A.0.2 of Appendix A of current national standard GB 50205-2001 Code for Acceptance of Construction Quality of Steel Structures.

Sample size:10% and at least 3 pieces for each batch of components of the same type；5% and at least 1 welding seam pass for each type of the welding seam of the sampled components，；1 spot on each welding seam pass，and at least 5 places in total.

Check method:Measuring with weld gauge.

3　The welding seam shall have a uniform appearance and a good shape，and shall be clear of welding slag and splash.

Sample size:10% and at least 3 pieces for each batch of components of the same type；5% for each type of welding seam of the sampled components；at least 5 spots in total.

Check method:Visual inspection.