When we planed to solve a great roof with a tubular grid bymeans of rigid joints instead of pined connections we thoughtthat the main problem could be local tension concentrationsand then proposed detailed analysis as well as model test todetermine if the plastic concentration around the weldedunions was dangerous.<br>In this paper we discus the problems found in theconstruction, welding and stress distribution studied bydifferent methods, mainly by Finite Element Method and realscale tests.<br>Finally the grid really built confirmed our previsions and wearrived at the conclusion of the good behaviour of the selectedmesh.<br><br>Al dise&#241;ar una gran cubierta con malla de tubos soldados enlugar de barras articuladas, nuestra principal preocupaci&#243;nera la concentraci&#243;n local de tensiones, unido a que laestructura no estaba triangulada. Propusimos, pues,detallados estudios para averiguar el l&#237;mite pl&#225;stico en tornoa las uniones soldadas.<br>En el art&#237;culo se analizan los problemas encontrados duranteel dise&#241;o y la construcci&#243;n por medio de modelos f&#237;sicos y demodelos por Elementos Finitos.<br>La conclusi&#243;n del montaje confirm&#243; el funcionamiento seg&#250;nlas previsiones.