MIL-HDBK-1890(AT)
d. Class 4 weld joint. Class 4 welded joints should not require radiographic or ultrasonic inspection.
4.3 Pressure test. When required, pressure tests should be performed in the proper sequence to determine conformance to the engineering requirements.
4.4 Acceptance criteria.
4.4.1 Arc (AW) and oxyfuel gas (OFW) welds. Welds resulting from fusion occurring in these processes should conform to the following:
a. Weld beads should be reasonably smooth and free from irregularities and should blend into the parent metal in smooth gradual curves.
b. The weld should show complete fusion without an excess of overlapping.
c. Edge weld penetration should be at least equal to or exceed thickness of the thinner material and should slightly overlap the outer edges of adjacent material to ensure the weld cross sectional area requirement.
d. The fillet weld size and intermittent or tack weld length should not be in excess of 1.5 times the value specified on the engineering drawing.
e. The surface imperfections of welds should be in accordance with the limits of acceptability stated in table I and II.
f. Scratches resulting from arc welding should not be evidenced on adjacent part areas.
g. Dimensional allowances for flush and convex welds should be as follows:
Nominal stock thickness inches(in.) |
Flush weld allowance |
Convex weld allowance |
0.000 to 0.030 0.031 to 0.080 0.081 to 0.156 0.157 and over |
0% to +20% 0% to +15% 0% to +10% 0% to +0.02 in. max. |
+10% to +60% +10% to +50% +10% to +40% +10% to 0.12 in. max. |
h. Dimensional allowance for butt welds on the crown and under-bead is a maximum of one third the thickness of the thinner material.
i. Cracks, incomplete penetration or fusion, porosity and voids, and metallic and non-metallic inclusions should be in accordance with the limits stated in table III and IV. Comparison reference radiographs are available from ASTM E390 and MIL-STD-1264.
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