Abstract: This antivibration sound insulation device is provided with: an antivibration mechanism which is mounted on a stand and disposed close to a prescribed sound source at a plant; and sound-absorbing sound insulation walls which are supported by the antivibration mechanism and arranged so as to surround the sound source.

Abstract: A method for overlay welding of stainless steel on the inner surfaces of pressure vessels as used for treating hydrogen at elevated temperature, e.g. below 450.degree. C. and under high pressure, e.g. below 150 kg/cm.sup.2, is provided wherein, in order to prevent the disbonding of the welded stainless steel, as the 1st layer weld overlay including martensitic structure of 4 to 40% by area or additionally including ferritic structure of up to 8% by area is used. For this purpose the chemical composition of the stainless steel weld metal is defined as essentially comprising of up to 0.1% C, up to 1.0% Si, up to 2.0% Mn, 7 to 12% Ni, 12 to 18% Cr, up to 1.0% Mo, and up to 0.1% Al, the balance being Fe. The stainless steel weld overlay may further include Nb of above 8 times the carbon content but up to 1.0%.